| From 6e6e41c3112276288ccaf80c70916779b84bb276 Mon Sep 17 00:00:00 2001 |
| From: Jason Wang <jasowang@redhat.com> |
| Date: Fri, 9 Feb 2018 17:45:49 +0800 |
| Subject: ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE |
| |
| From: Jason Wang <jasowang@redhat.com> |
| |
| 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> |
| |
| --- |
| include/linux/ptr_ring.h | 2 ++ |
| 1 file changed, 2 insertions(+) |
| |
| --- a/include/linux/ptr_ring.h |
| +++ b/include/linux/ptr_ring.h |
| @@ -453,6 +453,8 @@ static inline int ptr_ring_consume_batch |
| |
| 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); |
| } |
| |
