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authorRoland Dreier <roland@purestorage.com>2012-06-07 14:21:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-06-07 14:43:55 -0700
commitcbf8ae32f66a9ceb8907ad9e16663c2a29e48990 (patch)
tree0e290072f6c077fffeafd74b540c7536e3aa9873 /lib/mpi
parent7d8a45695cc8f9fcdf4121fcbd897ecb63f758e4 (diff)
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btree: fix tree corruption in btree_get_prev()
The memory the parameter __key points to is used as an iterator in btree_get_prev(), so if we save off a bkey() pointer in retry_key and then assign that to __key, we'll end up corrupting the btree internals when we do eg longcpy(__key, bkey(geo, node, i), geo->keylen); to return the key value. What we should do instead is use longcpy() to copy the key value that retry_key points to __key. This can cause a btree to get corrupted by seemingly read-only operations such as btree_for_each_safe. [akpm@linux-foundation.org: avoid the double longcpy()] Signed-off-by: Roland Dreier <roland@purestorage.com> Acked-by: Joern Engel <joern@logfs.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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