Commit 6e6e41c3 authored Feb 09, 2018 by Jason Wang Committed by David S. Miller Feb 09, 2018

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: 2e0ab8ca ("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>

parent 909ebd58

include/linux/ptr_ring.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);
		}