diff options
| author | NeilBrown <neilb@suse.de> | 2012-10-11 13:50:12 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-10-11 13:50:12 +1100 |
| commit | b97390aec4756373168ad2976e1f117b610513ea (patch) | |
| tree | bf800dcf15dd08774d2da161d6317294727d8e2c /drivers/md | |
| parent | 143c4d0573caebe0ae017097614349697e2280eb (diff) | |
| download | lwn-b97390aec4756373168ad2976e1f117b610513ea.tar.gz lwn-b97390aec4756373168ad2976e1f117b610513ea.zip | |
md/raid5: protect debug message against NULL derefernce.
The pr_debug in add_stripe_bio could race with something
changing *bip, so it is best to hold the lock until
after the pr_debug.
Reported-by: "Jianpeng Ma" <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 36c0a158730b..d11012604e28 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -2436,11 +2436,11 @@ static int add_stripe_bio(struct stripe_head *sh, struct bio *bi, int dd_idx, in if (sector >= sh->dev[dd_idx].sector + STRIPE_SECTORS) set_bit(R5_OVERWRITE, &sh->dev[dd_idx].flags); } - spin_unlock_irq(&sh->stripe_lock); pr_debug("added bi b#%llu to stripe s#%llu, disk %d.\n", (unsigned long long)(*bip)->bi_sector, (unsigned long long)sh->sector, dd_idx); + spin_unlock_irq(&sh->stripe_lock); if (conf->mddev->bitmap && firstwrite) { bitmap_startwrite(conf->mddev->bitmap, sh->sector, |