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md: raid5 crash during degradation

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NULL pointer access causes crash in raid5 module.

Signed-off-by: Adam Kwolek <[email protected]>
Signed-off-by: NeilBrown <[email protected]>
This commit is contained in:
Adam Kwolek 2011-12-09 14:26:11 +11:00 • committed by NeilBrown
commit 5d8c71f9e5
1 changed files with 2 additions and 2 deletions
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4
drivers/md/raid5.c
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@ -3070,7 +3070,7 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
if (sh->sector + STRIPE_SECTORS <= rdev->recovery_offset)
set_bit(R5_Insync, &dev->flags);
}
if (test_bit(R5_WriteError, &dev->flags)) {
if (rdev && test_bit(R5_WriteError, &dev->flags)) {
clear_bit(R5_Insync, &dev->flags);
if (!test_bit(Faulty, &rdev->flags)) {
s->handle_bad_blocks = 1;
@ -3078,7 +3078,7 @@ static void analyse_stripe(struct stripe_head *sh, struct stripe_head_state *s)
} else
clear_bit(R5_WriteError, &dev->flags);
}
if (test_bit(R5_MadeGood, &dev->flags)) {
if (rdev && test_bit(R5_MadeGood, &dev->flags)) {
if (!test_bit(Faulty, &rdev->flags)) {
s->handle_bad_blocks = 1;
atomic_inc(&rdev->nr_pending);