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authorJason Wang <jasowang@redhat.com>2018-02-09 17:45:49 +0800
committerDavid S. Miller <davem@davemloft.net>2018-02-09 14:28:57 -0500
commit6e6e41c3112276288ccaf80c70916779b84bb276 (patch)
tree336e9b2806125740656b3fcb6f0dc895ccd69acf /include
parent909ebd5840d158670eb88b2f73e9d38a894f28e2 (diff)
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ptr_ring.h2
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);
}

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