Commit 6e6e41c3 authored by Jason Wang's avatar Jason Wang Committed by David S. Miller

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: default avatarJason Wang <jasowang@redhat.com>
Acked-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 909ebd58
...@@ -466,6 +466,8 @@ static inline int ptr_ring_consume_batched_bh(struct ptr_ring *r, ...@@ -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) 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); return kcalloc(size, sizeof(void *), gfp);
} }
......
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