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authorIlya Dryomov <ilya.dryomov@inktank.com>2014-02-05 15:19:55 +0200
committerSage Weil <sage@inktank.com>2014-02-07 11:37:07 -0800
commit0ec1d15ec6ed513ab2cc86c67d94761d71228a32 (patch)
treecc8da7ba4af20ea86d1dccdbedcffeb19ddd2059 /net
parentff513ace9b772e75e337f8e058cc7f12816843fe (diff)
downloadlinux-stericsson-0ec1d15ec6ed513ab2cc86c67d94761d71228a32.tar.gz
libceph: do not dereference a NULL bio pointer
Commit f38a5181d9f3 ("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: Ilya Dryomov <ilya.dryomov@inktank.com> Reviewed-by: Sage Weil <sage@inktank.com>
Diffstat (limited to 'net')
-rw-r--r--net/ceph/messenger.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 0e478a0f4204..30efc5c18622 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -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);