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ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE

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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>
This commit is contained in:
Jason Wang 2018-02-09 17:45:49 +08:00 committed by Greg Kroah-Hartman
parent 73e6a383d1
commit 6688494804
1 changed files with 2 additions and 0 deletions
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2
include/linux/ptr_ring.h
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@ -447,6 +447,8 @@ 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);
}