diff options
| author | Jason Wang <jasowang@redhat.com> | 2018-02-09 17:45:49 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-25 11:05:41 +0100 |
| commit | 5fd4db305f2750418151d2d5553bfaec2956167a (patch) | |
| tree | 5a26dffdfdd91764f4b0fb64bd6740400add6f29 /include | |
| parent | eeb1f9bd2480eab16f77aeafacec08c82f71a972 (diff) | |
ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE
commit 6e6e41c3112276288ccaf80c70916779b84bb276 upstream.
To avoid slab to warn about exceeded size, fail early if queue
occupies more than KMALLOC_MAX_SIZE.
Reported-by: syzbot+e4d4f9ddd4295539735d@syzkaller.appspotmail.com
Fixes: 2e0ab8ca83c12 ("ptr_ring: array based FIFO for pointers")
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ptr_ring.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h index e38f471a5402..05c6d20c2a7a 100644 --- a/include/linux/ptr_ring.h +++ b/include/linux/ptr_ring.h @@ -351,6 +351,8 @@ static inline void *ptr_ring_consume_bh(struct ptr_ring *r) static inline void **__ptr_ring_init_queue_alloc(unsigned int size, gfp_t gfp) { + if (size * sizeof(void *) > KMALLOC_MAX_SIZE) + return NULL; return kcalloc(size, sizeof(void *), gfp); } |