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ocfs2/o2hb: check len for bio_add_page() to avoid getting incorrect bio

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We need to check len for bio_add_page() to make sure the bio has been
set up correctly, otherwise we may submit incorrect data to device.

Link: http://lkml.kernel.org/r/5ABC3EBE.5020807@huawei.com
Signed-off-by: Jun Piao <piaojun@huawei.com>
Reviewed-by: Yiwen Jiang <jiangyiwen@huawei.com>
Reviewed-by: Changwei Ge <ge.changwei@h3c.com>
Acked-by: Joseph Qi <jiangqi903@gmail.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <ge.changwei@h3c.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
piaojun 2018-04-05 16:19:36 -07:00 committed by Linus Torvalds
parent 39ec3774e3
commit ba16ddfbeb
1 changed files with 10 additions and 1 deletions
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11
fs/ocfs2/cluster/heartbeat.c
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@ -570,7 +570,16 @@ static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg,
current_page, vec_len, vec_start);
len = bio_add_page(bio, page, vec_len, vec_start);
if (len != vec_len) break;
if (len != vec_len) {
mlog(ML_ERROR, "Adding page[%d] to bio failed, "
"page %p, len %d, vec_len %u, vec_start %u, "
"bi_sector %llu\n", current_page, page, len,
vec_len, vec_start,
(unsigned long long)bio->bi_iter.bi_sector);
bio_put(bio);
bio = ERR_PTR(-EIO);
return bio;
}
cs += vec_len / (PAGE_SIZE/spp);
vec_start = 0;