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Date: Mon, 03 Dec 2012 14:32:52 +0000 From: Ben Hutchings <ben@...adent.org.uk> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, majianpeng <majianpeng@...il.com>, NeilBrown <neilb@...e.de> Subject: [ 66/89] md: Avoid write invalid address if read_seqretry returned true. 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: majianpeng <majianpeng@...il.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: zhuwenfeng@...acom.com Tested-by: zhuwenfeng@...acom.com Signed-off-by: Jianpeng Ma <majianpeng@...il.com> Signed-off-by: NeilBrown <neilb@...e.de> Signed-off-by: Ben Hutchings <ben@...adent.org.uk> --- drivers/md/md.c | 4 ++-- 1 file 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)) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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