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PM: hibernate: Fix memory leak in snapshot_write_next() error path

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When memory_bm_create() succeeds for copy_bm but fails for zero_bm,
the function returns without freeing the resources allocated for
copy_bm. This results in a memory leak that includes radix tree nodes,
zone structures, and page lists.

Fix this by calling memory_bm_free() to release copy_bm's resources
before returning the error code when zero_bm allocation fails.

Fixes: 005e8dddd4 ("PM: hibernate: don't store zero pages in the image file")
Signed-off-by: Malaya Kumar Rout <malayarout91@gmail.com>
Acked-by: Brian Geffon <bgeffon@google.com>
Link: https://patch.msgid.link/20260711145246.8625-1-malayarout91@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Malaya Kumar Rout
2026-07-11 20:22:45 +05:30
committed by Rafael J. Wysocki
parent 45a7c1077b
commit 21d5c4cee3
1 changed files with 3 additions and 2 deletions
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5
kernel/power/snapshot.c
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@@ -2797,9 +2797,10 @@ int snapshot_write_next(struct snapshot_handle *handle)
return error;
error = memory_bm_create(&zero_bm, GFP_ATOMIC, PG_ANY);
if (error)
if (error) {
memory_bm_free(&copy_bm, PG_UNSAFE_CLEAR);
return error;
}
nr_zero_pages = 0;
hibernate_restore_protection_begin();