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 11:15:39 +0100 |
| commit | 62a273a47514ee033f4c872d07c8789eea43a1ba (patch) | |
| tree | 617a1d7edcd655a009b350cbba1aa677810a322e /include/linux | |
| parent | de03f1a1c9e3a2fe442849596874f00e79bec737 (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/linux')
| -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 d72b2e7dd500..198cf07a7ee7 100644 --- a/include/linux/ptr_ring.h +++ b/include/linux/ptr_ring.h @@ -453,6 +453,8 @@ static inline int ptr_ring_consume_batched_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); } |