3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: majianpeng <majianp...@gmail.com>
commit 35f9ac2dcec8f79d7059ce174fd7b7ee3290d620 upstream.
If read_seqretry returned true and bbp was changed, it will write
invalid address which can cause some serious problem.
This bug was introduced by commit v3.0-rc7-130-g2699b67.
So fix is suitable for 3.0.y thru 3.6.y.
Reported-by: zhuwenf...@kedacom.com
Tested-by: zhuwenf...@kedacom.com
Signed-off-by: Jianpeng Ma <majianp...@gmail.com>
Signed-off-by: NeilBrown <ne...@suse.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/md/md.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1805,10 +1805,10 @@ retry:
memset(bbp, 0xff, PAGE_SIZE);
for (i = 0 ; i < bb->count ; i++) {
- u64 internal_bb = *p++;
+ u64 internal_bb = p[i];
u64 store_bb = ((BB_OFFSET(internal_bb) << 10)
| BB_LEN(internal_bb));
- *bbp++ = cpu_to_le64(store_bb);
+ bbp[i] = cpu_to_le64(store_bb);
}
bb->changed = 0;
if (read_seqretry(&bb->lock, seq))
--
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