From: Wentao_Liang Wentao_Liang_g@163.com
[ Upstream commit 104212471b1c1817b311771d817fb692af983173 ]
In line 2884, "raid5_release_stripe(sh);" drops the reference to sh and may cause sh to be released. However, sh is subsequently used in lines 2886 "if (sh->batch_head && sh != sh->batch_head)". This may result in an use-after-free bug.
It can be fixed by moving "raid5_release_stripe(sh);" to the bottom of the function.
Signed-off-by: Wentao_Liang Wentao_Liang_g@163.com Signed-off-by: Song Liu song@kernel.org Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/md/raid5.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index b396e78b1b6d..bea171a5e663 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2513,10 +2513,10 @@ static void raid5_end_write_request(struct bio *bi) if (!test_and_clear_bit(R5_DOUBLE_LOCKED, &sh->dev[i].flags)) clear_bit(R5_LOCKED, &sh->dev[i].flags); set_bit(STRIPE_HANDLE, &sh->state); - raid5_release_stripe(sh);
if (sh->batch_head && sh != sh->batch_head) raid5_release_stripe(sh->batch_head); + raid5_release_stripe(sh); }
static void raid5_build_block(struct stripe_head *sh, int i, int previous)