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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>
This commit is contained in:
Roland Dreier 2012-06-07 14:21:13 -07:00 committed by Linus Torvalds
parent 7d8a45695c
commit cbf8ae32f6
1 changed files with 2 additions and 2 deletions
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4
lib/btree.c
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@ -319,8 +319,8 @@ void *btree_get_prev(struct btree_head *head, struct btree_geo *geo,
if (head->height == 0)
return NULL;
retry:
longcpy(key, __key, geo->keylen);
retry:
dec_key(geo, key);
node = head->node;
@ -351,7 +351,7 @@ void *btree_get_prev(struct btree_head *head, struct btree_geo *geo,
}
miss:
if (retry_key) {
__key = retry_key;
longcpy(key, retry_key, geo->keylen);
retry_key = NULL;
goto retry;
}