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authorOleg Nesterov <oleg@redhat.com>2010-04-23 13:18:01 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-04-24 11:31:25 -0700
commit31f2b0ebc01fd332cb0997f7ce9f9cde29af9e20 (patch)
treefc9d4cb410052afcc56bb8442a2dbcb8950464a8 /drivers/w1
parent93b4a44f3ad69520d605aace3f3486b8eb754b96 (diff)
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rmap: anon_vma_prepare() can leak anon_vma_chain
If find_mergeable_anon_vma() succeeds but another thread installs ->anon_vma before we take ptl, then allocated == NULL but avc should be freed. Change the code to check avc != NULL to detect this case. Also, a couple of whitespace changes to make the critical section more visible. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Rik van Riel <riel@redhat.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Pete Zaitcev <zaitcev@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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