diff options
| author | Prasad J Pandit <pjp@fedoraproject.org> | 2015-12-28 16:24:08 +0530 |
|---|---|---|
| committer | Jason Wang <jasowang@redhat.com> | 2016-01-11 11:01:35 +0800 |
| commit | 007cd223de527b5f41278f2d886c1a4beb3e67aa (patch) | |
| tree | 41264b550bfb0415e31348114846dfbcdaeead52 /hw/net | |
| parent | 7d6d347d0602997a7fcb33b7edd20f8d8515b48b (diff) | |
net: rocker: fix an incorrect array bounds check
While processing transmit(tx) descriptors in 'tx_consume' routine
the switch emulator suffers from an off-by-one error, if a
descriptor was to have more than allowed(ROCKER_TX_FRAGS_MAX=16)
fragments. Fix an incorrect bounds check to avoid it.
Reported-by: Qinghao Tang <luodalongde@gmail.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'hw/net')
| -rw-r--r-- | hw/net/rocker/rocker.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/hw/net/rocker/rocker.c b/hw/net/rocker/rocker.c index c57f1a661a..2e77e5086a 100644 --- a/hw/net/rocker/rocker.c +++ b/hw/net/rocker/rocker.c @@ -232,6 +232,9 @@ static int tx_consume(Rocker *r, DescInfo *info) frag_addr = rocker_tlv_get_le64(tlvs[ROCKER_TLV_TX_FRAG_ATTR_ADDR]); frag_len = rocker_tlv_get_le16(tlvs[ROCKER_TLV_TX_FRAG_ATTR_LEN]); + if (iovcnt >= ROCKER_TX_FRAGS_MAX) { + goto err_too_many_frags; + } iov[iovcnt].iov_len = frag_len; iov[iovcnt].iov_base = g_malloc(frag_len); if (!iov[iovcnt].iov_base) { @@ -244,10 +247,7 @@ static int tx_consume(Rocker *r, DescInfo *info) err = -ROCKER_ENXIO; goto err_bad_io; } - - if (++iovcnt > ROCKER_TX_FRAGS_MAX) { - goto err_too_many_frags; - } + iovcnt++; } if (iovcnt) { |