diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2014-04-08 22:43:43 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-06 07:59:36 -0700 |
| commit | b4140e2b766bb20f0eb9d363be9072905977c5e0 (patch) | |
| tree | 13ce020489be8aa3850423f993720ed208239e69 | |
| parent | fc7b1646bf29f722277bdd19551e01420ce9da8f (diff) | |
block: Fix for_each_bvec()
commit b7aa84d9cb9f26da1a9312c3e39dbd1a3c25a426 upstream.
Commit 4550dd6c6b062 introduced for_each_bvec() which iterates over each
bvec attached to a bio or bip. However, the macro fails to check bi_size
before dereferencing which can lead to crashes while counting/mapping
integrity scatterlist segments.
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Kent Overstreet <kmo@daterainc.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | include/linux/bio.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/bio.h b/include/linux/bio.h index 5a4d39b4686..5aa372a7380 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -216,9 +216,9 @@ static inline void bvec_iter_advance(struct bio_vec *bv, struct bvec_iter *iter, } #define for_each_bvec(bvl, bio_vec, iter, start) \ - for ((iter) = start; \ - (bvl) = bvec_iter_bvec((bio_vec), (iter)), \ - (iter).bi_size; \ + for (iter = (start); \ + (iter).bi_size && \ + ((bvl = bvec_iter_bvec((bio_vec), (iter))), 1); \ bvec_iter_advance((bio_vec), &(iter), (bvl).bv_len)) |