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rmap: fix anon_vma_fork() memory leak

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Fix a memory leak in anon_vma_fork(), where we fail to tear down the
anon_vmas attached to the new VMA in case setting up the new anon_vma
fails.

This bug also has the potential to leave behind anon_vma_chain structs
with pointers to invalid memory.

Reported-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rik van Riel 2010-04-05 12:13:33 -04:00 committed by Linus Torvalds
parent db217dece3
commit 4946d54cb5
1 changed files with 1 additions and 0 deletions
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mm/rmap.c
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@ -232,6 +232,7 @@ int anon_vma_fork(struct vm_area_struct *vma, struct vm_area_struct *pvma)
out_error_free_anon_vma:
anon_vma_free(anon_vma);
out_error:
unlink_anon_vmas(vma);
return -ENOMEM;
}