commit: 35f9ac2dcec8f79d7059ce174fd7b7ee3290d620 From: majianpeng <[email protected]> Date: Thu, 8 Nov 2012 08:56:27 +0800 Subject: md: Avoid write invalid address if read_seqretry returned true.
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: [email protected] Tested-by: [email protected] Cc: [email protected] Signed-off-by: Jianpeng Ma <[email protected]> Signed-off-by: NeilBrown <[email protected]> --- drivers/md/md.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 14db6ab..4c7d880 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -1817,10 +1817,10 @@ 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)) -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
