diff options
| author | Gonglei <arei.gonglei@huawei.com> | 2017-01-03 14:50:03 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2017-01-10 05:56:58 +0200 |
| commit | a08aaff811fb194950f79711d2afe5a892ae03a4 (patch) | |
| tree | 4e7cc30b7d82c0494e7ae3dfdde88b69be332736 /hw/virtio | |
| parent | 8cdcf3c1e58d04b6811956d7608efeb66c42d719 (diff) | |
virtio-crypto: fix possible integer and heap overflow
Because the 'size_t' type is 4 bytes in 32-bit platform, which
is the same with 'int'. It's easy to make 'max_len' to zero when
integer overflow and then cause heap overflow if 'max_len' is zero.
Using uint_64 instead of size_t to avoid the integer overflow.
Cc: qemu-stable@nongnu.org
Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Tested-by: Li Qiang <liqiang6-s@360.cn>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/virtio')
| -rw-r--r-- | hw/virtio/virtio-crypto.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c index 2f2467e859..c23e1ad458 100644 --- a/hw/virtio/virtio-crypto.c +++ b/hw/virtio/virtio-crypto.c @@ -416,7 +416,7 @@ virtio_crypto_sym_op_helper(VirtIODevice *vdev, uint32_t hash_start_src_offset = 0, len_to_hash = 0; uint32_t cipher_start_src_offset = 0, len_to_cipher = 0; - size_t max_len, curr_size = 0; + uint64_t max_len, curr_size = 0; size_t s; /* Plain cipher */ @@ -441,7 +441,7 @@ virtio_crypto_sym_op_helper(VirtIODevice *vdev, return NULL; } - max_len = iv_len + aad_len + src_len + dst_len + hash_result_len; + max_len = (uint64_t)iv_len + aad_len + src_len + dst_len + hash_result_len; if (unlikely(max_len > vcrypto->conf.max_size)) { virtio_error(vdev, "virtio-crypto too big length"); return NULL; |