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Date: Wed, 6 Jun 2012 10:17:26 -0700
From: Roland Dreier <roland@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Joern Engel <joern@...fs.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] btree: Fix tree corruption in btree_get_prev()
From: Roland Dreier <roland@...estorage.com>
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.
Acked-by: Joern Engel <joern@...fs.org>
Cc: <stable@...r.kernel.org>
Signed-off-by: Roland Dreier <roland@...estorage.com>
---
lib/btree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/btree.c b/lib/btree.c
index e5ec1e9..b6e889b 100644
--- a/lib/btree.c
+++ b/lib/btree.c
@@ -351,7 +351,7 @@ retry:
}
miss:
if (retry_key) {
- __key = retry_key;
+ longcpy(__key, retry_key, geo->keylen);
retry_key = NULL;
goto retry;
}
--
1.7.9.5
--
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