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| author | Jason Wang <jasowang@redhat.com> | 2018-02-09 17:45:49 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-02-09 14:28:57 -0500 |
| commit | 6e6e41c3112276288ccaf80c70916779b84bb276 (patch) | |
| tree | 336e9b2806125740656b3fcb6f0dc895ccd69acf | |
| parent | 909ebd5840d158670eb88b2f73e9d38a894f28e2 (diff) | |
| download | linux-6e6e41c3112276288ccaf80c70916779b84bb276.tar.bz2 | |
ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE
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>
| -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 1883d6137e9b..6051a5fe6913 100644 --- a/include/linux/ptr_ring.h +++ b/include/linux/ptr_ring.h @@ -466,6 +466,8 @@ 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); } |