From mboxrd@z Thu Jan 1 00:00:00 1970 From: piaojun Date: Wed, 28 Mar 2018 15:02:04 +0800 Subject: [Ocfs2-devel] [PATCH] ocfs2/o2hb: check len for bio_add_page() to avoid submitting incorrect bio In-Reply-To: <9c5f2dca-dc05-c36d-c6ec-24171fe0a94f@gmail.com> References: <5ABB110A.3050808@huawei.com> <9c5f2dca-dc05-c36d-c6ec-24171fe0a94f@gmail.com> Message-ID: <5ABB3DEC.5020507@huawei.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ocfs2-devel@oss.oracle.com Hi Joseph, On 2018/3/28 12:58, Joseph Qi wrote: > > > On 18/3/28 11:50, piaojun wrote: >> We need check len for bio_add_page() to make sure the bio has been set up >> correctly, otherwise we may submit incorrect data to device. >> >> Signed-off-by: Jun Piao >> Reviewed-by: Yiwen Jiang >> --- >> fs/ocfs2/cluster/heartbeat.c | 11 ++++++++++- >> 1 file changed, 10 insertions(+), 1 deletion(-) >> >> diff --git a/fs/ocfs2/cluster/heartbeat.c b/fs/ocfs2/cluster/heartbeat.c >> index ea8c551..43ad79f 100644 >> --- a/fs/ocfs2/cluster/heartbeat.c >> +++ b/fs/ocfs2/cluster/heartbeat.c >> @@ -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(-EFAULT); > > IMO, EFAULT is not an appropriate error code here. > If __bio_add_page returns 0, some are caused by bio checking failed. > Also I've noticed that several other callers just use ENOMEM, so I think > EINVAL or ENOMEM may be better. __bio_add_page has been deleted in patch c66a14d07c13, and I notice that other callers always use -EFAULT or -EIO. I'm afraid we are not basing on the same kernel source. thansk, Jun > > Thanks, > Joseph > >> + return bio; >> + } >> >> cs += vec_len / (PAGE_SIZE/spp); >> vec_start = 0; >> > . >