out_stackdriver: fix memory leaks in pthread resources and mutex #11331
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📝 WalkthroughWalkthroughAdds guarded, reference-counted OAuth2 cache initialization and cleanup, changes Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~23 minutes Suggested labels
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🚥 Pre-merge checks | ✅ 2 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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🚧 Files skipped from review as they are similar to previous changes (3)
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⚠️ Outside diff range comments (1)
plugins/out_stackdriver/stackdriver.c (1)
67-73: Critical: Check pthread_key_create return values before setting flag.The
pthread_key_create()calls at lines 70-72 can fail (returningEAGAINorENOMEM), but their return values are not checked. If any key creation fails, settingoauth2_cache_initialized = FLB_TRUEat line 1250 will causepthread_key_delete()to be called on uninitialized keys during cleanup, resulting in undefined behavior.🔎 Proposed fix to add error handling
Modify
oauth2_cache_init()to return an error code and check it before setting the flag:-static void oauth2_cache_init() +static int oauth2_cache_init() { + int ret; /* oauth2 pthread key */ - pthread_key_create(&oauth2_type, oauth2_cache_exit); - pthread_key_create(&oauth2_token, oauth2_cache_exit); - pthread_key_create(&oauth2_token_expires, oauth2_cache_free_expiration); + ret = pthread_key_create(&oauth2_type, oauth2_cache_exit); + if (ret != 0) { + return -1; + } + ret = pthread_key_create(&oauth2_token, oauth2_cache_exit); + if (ret != 0) { + pthread_key_delete(oauth2_type); + return -1; + } + ret = pthread_key_create(&oauth2_token_expires, oauth2_cache_free_expiration); + if (ret != 0) { + pthread_key_delete(oauth2_type); + pthread_key_delete(oauth2_token); + return -1; + } + return 0; }Then in
cb_stackdriver_init():/* Initialize oauth2 cache pthread keys */ - oauth2_cache_init(); - ctx->oauth2_cache_initialized = FLB_TRUE; + ret = oauth2_cache_init(); + if (ret != 0) { + flb_plg_error(ins, "failed to initialize oauth2 cache"); + return -1; + } + ctx->oauth2_cache_initialized = FLB_TRUE;Also applies to: 1249-1250
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Configuration used: defaults
Review profile: CHILL
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📒 Files selected for processing (3)
plugins/out_stackdriver/stackdriver.cplugins/out_stackdriver/stackdriver.hplugins/out_stackdriver/stackdriver_conf.c
🧰 Additional context used
🧠 Learnings (1)
📚 Learning: 2025-12-17T18:45:02.283Z
Learnt from: edsiper
Repo: fluent/fluent-bit PR: 11286
File: src/flb_http_client.c:1657-1715
Timestamp: 2025-12-17T18:45:02.283Z
Learning: In the Fluent Bit OAuth2 implementation (src/flb_oauth2.c), the function flb_oauth2_get_access_token returns a pointer to the cached token stored in the OAuth2 context (ctx->access_token), not a new allocation. The OAuth2 context manages the token lifecycle, so callers must not free the returned token pointer.
Applied to files:
plugins/out_stackdriver/stackdriver_conf.cplugins/out_stackdriver/stackdriver.hplugins/out_stackdriver/stackdriver.c
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🔇 Additional comments (4)
plugins/out_stackdriver/stackdriver.h (1)
207-208: LGTM! Initialization flags added for safe cleanup.The addition of
token_mutex_initializedandoauth2_cache_initializedflags enables guarded destruction of pthread resources, preventing undefined behavior when destroying uninitialized mutexes or pthread keys. The placement immediately aftertoken_mutexis logical and the naming is clear.plugins/out_stackdriver/stackdriver.c (2)
75-82: LGTM! Proper guarded cleanup of pthread keys.The function correctly checks the initialization flag before deleting pthread keys, preventing undefined behavior. All three pthread keys created in
oauth2_cache_init()are properly cleaned up.
3093-3104: LGTM! Proper cleanup order in exit function.The
oauth2_cache_cleanup()call is correctly placed beforeflb_stackdriver_conf_destroy(), ensuring pthread keys are deleted before the context is destroyed. The NULL check forctxprovides additional safety.plugins/out_stackdriver/stackdriver_conf.c (1)
709-711: Mutex destruction is safe due to framework guarantees—no additional synchronization needed.The Fluent Bit framework's shutdown sequence in
flb_output_exit()(src/flb_output.c:542-577) guarantees thatflb_output_thread_pool_destroy()is called at line 562, which joins all worker threads viapthread_join(), before the plugin'scb_exit()is invoked at line 567. This ensures no worker thread can hold thetoken_mutexwhenpthread_mutex_destroy()executes. Error paths during initialization that callflb_stackdriver_conf_destroy()occur before any worker threads start, so the mutex cannot be locked in those scenarios either. The guard check fortoken_mutex_initializedis appropriate for preventing double-destroy but is not the primary protection against destroying a locked mutex—that protection comes from the framework's inherent design.
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🧠 Learnings (1)
📚 Learning: 2025-12-17T18:45:02.283Z
Learnt from: edsiper
Repo: fluent/fluent-bit PR: 11286
File: src/flb_http_client.c:1657-1715
Timestamp: 2025-12-17T18:45:02.283Z
Learning: In the Fluent Bit OAuth2 implementation (src/flb_oauth2.c), the function flb_oauth2_get_access_token returns a pointer to the cached token stored in the OAuth2 context (ctx->access_token), not a new allocation. The OAuth2 context manages the token lifecycle, so callers must not free the returned token pointer.
Applied to files:
plugins/out_stackdriver/stackdriver.c
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🔇 Additional comments (3)
plugins/out_stackdriver/stackdriver.c (3)
67-88: LGTM! Proper error handling in oauth2_cache_init().The function correctly handles pthread_key_create() failures with progressive cleanup of previously created keys, preventing partial initialization.
90-97: LGTM! Cleanup function properly guards pthread_key_delete().The function correctly checks the initialization flag before deleting the three pthread keys.
3124-3124: LGTM! Exit function properly cleans up oauth2 cache.The cleanup is correctly positioned before context destruction.
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🧠 Learnings (1)
📚 Learning: 2025-12-17T18:45:02.283Z
Learnt from: edsiper
Repo: fluent/fluent-bit PR: 11286
File: src/flb_http_client.c:1657-1715
Timestamp: 2025-12-17T18:45:02.283Z
Learning: In the Fluent Bit OAuth2 implementation (src/flb_oauth2.c), the function flb_oauth2_get_access_token returns a pointer to the cached token stored in the OAuth2 context (ctx->access_token), not a new allocation. The OAuth2 context manages the token lifecycle, so callers must not free the returned token pointer.
Applied to files:
plugins/out_stackdriver/stackdriver.c
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🔇 Additional comments (4)
plugins/out_stackdriver/stackdriver.c (4)
67-88: LGTM!The function properly handles initialization failures with cascading cleanup. Each pthread_key_create failure correctly deletes any previously created keys before returning, preventing resource leaks on partial initialization.
1264-1277: LGTM!Proper error handling for both oauth2 cache and mutex initialization. The
pthread_mutex_init()return value is now checked (addressing the previous review feedback), and flags are set only after successful initialization.
1288-1298: Error paths now properly clean up oauth2 cache resources.The consistent use of
goto error_oauth2ensures pthread keys are cleaned up on failure paths, addressing the previous review feedback about leaked resources.
3120-3131: LGTM!Proper cleanup sequence in the exit callback: oauth2 cache cleanup followed by config destruction. This ensures both pthread keys and mutex are properly released on normal shutdown.
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♻️ Duplicate comments (1)
plugins/out_stackdriver/stackdriver.c (1)
1276-1290: Critical: Instance count leak on error path.After incrementing
oauth2_instance_countat line 1282, ifpthread_mutex_init()fails at line 1286, the function returns -1 without decrementing the counter. This leaks the reference count and will prevent proper cleanup of pthread keys.The instance count increment should either be moved inside
oauth2_cache_init()(to make it atomic with the initialization check), or all error paths after line 1282 must calloauth2_cache_cleanup(ctx).🔎 Recommended fix
ret = pthread_mutex_init(&ctx->token_mutex, NULL); if (ret != 0) { flb_plg_error(ins, "failed to initialize token mutex"); + oauth2_cache_cleanup(ctx); return -1; } ctx->token_mutex_initialized = FLB_TRUE;Apply the same pattern to any other error returns after line 1282 (though none are visible in this diff).
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🧠 Learnings (1)
📚 Learning: 2025-12-17T18:45:02.283Z
Learnt from: edsiper
Repo: fluent/fluent-bit PR: 11286
File: src/flb_http_client.c:1657-1715
Timestamp: 2025-12-17T18:45:02.283Z
Learning: In the Fluent Bit OAuth2 implementation (src/flb_oauth2.c), the function flb_oauth2_get_access_token returns a pointer to the cached token stored in the OAuth2 context (ctx->access_token), not a new allocation. The OAuth2 context manages the token lifecycle, so callers must not free the returned token pointer.
Applied to files:
plugins/out_stackdriver/stackdriver.c
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🔇 Additional comments (3)
plugins/out_stackdriver/stackdriver.c (3)
70-97: Error handling is correct, but depends on race condition fix.The error handling logic properly cleans up pthread keys on failure. However, the effectiveness of the re-initialization guard at lines 74-76 and the setting of
oauth2_global_initializedat line 95 depend on fixing the race condition identified in lines 53-54.Once the mutex protection is added, verify that this function is correctly synchronized.
99-109: Reference counting logic is correct, but requires synchronization.The cleanup logic properly uses reference counting and guards against double-delete by resetting
oauth2_global_initializedto 0. However, all operations here (decrement at line 101, check at line 103, and subsequent cleanup) must be protected by the same mutex mentioned in the earlier comment to prevent race conditions.After adding mutex protection, verify that
oauth2_instance_countcannot go negative due to mismatched init/cleanup calls.
1137-1137: LGTM!The cleanup call is correctly placed in the exit callback.
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Track oauth2 cache init with a refcounted lock and release it on init failures and plugin exit, so pthread keys are not leaked. Guard token mutex cleanup to avoid destroying uninitialized locks. Signed-off-by: Yu Yi <[email protected]>
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⚠️ Outside diff range comments (1)
plugins/out_stackdriver/stackdriver.c (1)
1273-1389: Avoid dangling output context on init failure (clear context before freeingctx).Since
flb_output_set_context(ins, ctx)happens before severalgoto errorpaths, the error path should defensively clear the instance context before destroying/freeingctx(prevents accidental use-after-free if anything consultsinsafter a failed init).Proposed minimal patch
error: if (ctx->oauth2_cache_acquired == FLB_TRUE) { oauth2_cache_cleanup(); ctx->oauth2_cache_acquired = FLB_FALSE; } + /* Defensive: avoid leaving a dangling ctx in the output instance on init failure */ + flb_output_set_context(ins, NULL); flb_stackdriver_conf_destroy(ctx); return -1;
🧹 Nitpick comments (1)
plugins/out_stackdriver/stackdriver_conf.c (1)
709-711: Guardedpthread_mutex_destroy()is the right fix; consider handling destroy failures.The
ctx->token_mutex_initializedcheck prevents destroying an uninitialized mutex (good). Consider at least checking/loggingpthread_mutex_destroy()’s return code (e.g., EBUSY) to avoid silently skipping cleanup in unexpected teardown ordering.
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🧠 Learnings (2)
📓 Common learnings
Learnt from: edsiper
Repo: fluent/fluent-bit PR: 11286
File: src/flb_http_client.c:1657-1715
Timestamp: 2025-12-17T18:45:02.283Z
Learning: In the Fluent Bit OAuth2 implementation (src/flb_oauth2.c), the function flb_oauth2_get_access_token returns a pointer to the cached token stored in the OAuth2 context (ctx->access_token), not a new allocation. The OAuth2 context manages the token lifecycle, so callers must not free the returned token pointer.
📚 Learning: 2025-12-17T18:45:02.283Z
Learnt from: edsiper
Repo: fluent/fluent-bit PR: 11286
File: src/flb_http_client.c:1657-1715
Timestamp: 2025-12-17T18:45:02.283Z
Learning: In the Fluent Bit OAuth2 implementation (src/flb_oauth2.c), the function flb_oauth2_get_access_token returns a pointer to the cached token stored in the OAuth2 context (ctx->access_token), not a new allocation. The OAuth2 context manages the token lifecycle, so callers must not free the returned token pointer.
Applied to files:
plugins/out_stackdriver/stackdriver_conf.cplugins/out_stackdriver/stackdriver.c
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🔇 Additional comments (3)
plugins/out_stackdriver/stackdriver.c (3)
53-56: Process-wide lock + refcount for OAuth2 cache is a solid direction.Making the cache state process-global and guarded avoids repeated key creation across reloads/instances.
3160-3163: Exit-time OAuth2 cache release is correctly gated byoauth2_cache_acquired.This matches the init-time acquisition and keeps cleanup balanced across error paths and normal shutdown.
71-107: Thread synchronization is properly ensured by the framework—no issue here.The plugin's destroy path is safe: the core framework explicitly calls
flb_output_thread_pool_destroy()(which joins all worker threads withpthread_join()) before invokingcb_exit(). Worker threads cannot access the TLS keys afterpthread_join()returns, and TLS destructors run as threads exit. The refcountedoauth2_cache_init()/oauth2_cache_cleanup()pattern correctly handles multiple plugin instances.Likely an incorrect or invalid review comment.
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Fixed critical memory leaks in Stackdriver output plugin where thread-specific storage and synchronization resources were never released during plugin lifecycle.
The 3 pthread keys (oauth2_type, oauth2_token, oauth2_token_expires) created in oauth2_cache_init() were never deleted with pthread_key_delete().
The mutex (token_mutex) created in cb_stackdriver_init() was never destroyed with pthread_mutex_destroy().
Each worker thread accumulates leaked resources. With multiple workers or frequent configuration reloads, memory usage grows unbounded.
Added oauth2_cache_cleanup() function to delete all pthread keys and call it in cb_stackdriver_exit() before context cleanup. Added pthread_mutex_destroy() in flb_stackdriver_conf_destroy().
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