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maxyang pushed a commit to branch main
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The following commit(s) were added to refs/heads/main by this push:
new 65cd966d5a1 Fix double free issue in alterResgroupCallback during
io_limit cleanup
65cd966d5a1 is described below
commit 65cd966d5a144dfe861d5107ac2db0be0ad18798
Author: zhangyue <zhang...@hashdata.cn>
AuthorDate: Thu Aug 21 13:19:53 2025 +0800
Fix double free issue in alterResgroupCallback during io_limit cleanup
We need to handle two scenarios:
1. When caps.io_limit differs from oldCaps.io_limit — this corresponds to
the RESGROUP_LIMIT_TYPE_IO_LIMIT case.
2. When caps.io_limit is equal to oldCaps.io_limit — this applies to
all other cases.
The original code causes a double free issue in the second scenario ("other
cases").
---
src/backend/commands/resgroupcmds.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/src/backend/commands/resgroupcmds.c
b/src/backend/commands/resgroupcmds.c
index 5c319e85b11..f6ee4fefc34 100644
--- a/src/backend/commands/resgroupcmds.c
+++ b/src/backend/commands/resgroupcmds.c
@@ -1093,10 +1093,23 @@ alterResgroupCallback(XactEvent event, void *arg)
if (event == XACT_EVENT_COMMIT)
ResGroupAlterOnCommit(callbackCtx);
+ /*
+ * Free io_limit resources allocated in AlterResourceGroup().
+ *
+ * We need to handle two cases:
+ * 1. caps.io_limit != oldCaps.io_limit: case
RESGROUP_LIMIT_TYPE_IO_LIMIT
+ * 2. caps.io_limit == oldCaps.io_limit: other cases
+ *
+ * The pointer comparison (oldCaps.io_limit != caps.io_limit) is
crucial to
+ * avoid double free errors. When "other cases", both pointers might
+ * reference the same memory location, so we only free oldCaps.io_limit
if
+ * it's different from caps.io_limit.
+ */
if (callbackCtx->caps.io_limit != NIL)
cgroupOpsRoutine->freeio(callbackCtx->caps.io_limit);
- if (callbackCtx->caps.io_limit != NIL)
+ if (callbackCtx->oldCaps.io_limit != NIL &&
+ callbackCtx->oldCaps.io_limit != callbackCtx->caps.io_limit)
cgroupOpsRoutine->freeio(callbackCtx->oldCaps.io_limit);
pfree(callbackCtx);
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