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Revert "net: ptr_ring: otherwise safe empty checks can overrun array bounds" 

This reverts commit bcecb4bbf8.

If we try to allocate an extra entry as the above commit did, and when
the requested size is UINT_MAX, addition overflows causing zero size to
be passed to kmalloc().

kmalloc then returns ZERO_SIZE_PTR with a subsequent crash.

Reported-by: syzbot+87678bcf753b44c39b67@syzkaller.appspotmail.com
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael S. Tsirkin 2018-01-26 01:36:35 +02:00 committed by David S. Miller
parent 84328342a7
commit 9fb582b670
1 changed files with 1 additions and 6 deletions
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7
include/linux/ptr_ring.h
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@ -466,12 +466,7 @@ 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)
{
/* Allocate an extra dummy element at end of ring to avoid consumer head
* or produce head access past the end of the array. Possible when
* producer/consumer operations and __ptr_ring_peek operations run in
* parallel.
*/
return kcalloc(size + 1, sizeof(void *), gfp);
return kcalloc(size, sizeof(void *), gfp);
}
static inline void __ptr_ring_set_size(struct ptr_ring *r, int size)