提交 0ec1d15e 编写于 作者: I Ilya Dryomov 提交者: Sage Weil

libceph: do not dereference a NULL bio pointer

Commit f38a5181 ("ceph: Convert to immutable biovecs") introduced
a NULL pointer dereference, which broke rbd in -rc1.  Fix it.

Cc: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: NIlya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: NSage Weil <sage@inktank.com>
上级 ff513ace
......@@ -840,9 +840,13 @@ static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor,
if (!cursor->bvec_iter.bi_size) {
bio = bio->bi_next;
cursor->bvec_iter = bio->bi_iter;
cursor->bio = bio;
if (bio)
cursor->bvec_iter = bio->bi_iter;
else
memset(&cursor->bvec_iter, 0,
sizeof(cursor->bvec_iter));
}
cursor->bio = bio;
if (!cursor->last_piece) {
BUG_ON(!cursor->resid);
......
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