diff options
| author | Jason Wang <jasowang@redhat.com> | 2018-02-11 11:28:12 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-30 07:51:54 +0200 |
| commit | 6fc72fd1565bcd7f872ad89cd0c7a60a7cf68c96 (patch) | |
| tree | 17313c45ca58fb71fd04c6b947ef5ffa80328818 /include | |
| parent | 052eb2d6dc619700281b1f70bb0eb9304ec04b07 (diff) | |
ptr_ring: prevent integer overflow when calculating size
[ Upstream commit 54e02162d4454a99227f520948bf4494c3d972d0 ]
Switch to use dividing to prevent integer overflow when size is too
big to calculate allocation size properly.
Reported-by: Eric Biggers <ebiggers3@gmail.com>
Fixes: 6e6e41c31122 ("ptr_ring: fail early if queue occupies more than KMALLOC_MAX_SIZE")
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: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ptr_ring.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/ptr_ring.h b/include/linux/ptr_ring.h index 35d125569e68..e8b12b79a0de 100644 --- a/include/linux/ptr_ring.h +++ b/include/linux/ptr_ring.h @@ -450,7 +450,7 @@ 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) { - if (size * sizeof(void *) > KMALLOC_MAX_SIZE) + if (size > KMALLOC_MAX_SIZE / sizeof(void *)) return NULL; return kvmalloc_array(size, sizeof(void *), gfp | __GFP_ZERO); } |