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[PULL,03/17] net: cadence_gem: check packet size in gem_recieve

Message ID 1454380581-7881-4-git-send-email-jasowang@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jason Wang Feb. 2, 2016, 2:36 a.m. UTC 
From: Prasad J Pandit <pjp@fedoraproject.org>

While receiving packets in 'gem_receive' routine, if Frame Check
Sequence(FCS) is enabled, it copies the packet into a local
buffer without checking its size. Add check to validate packet
length against the buffer size to avoid buffer overflow.

Reported-by: Ling Liu <liuling-it@360.cn>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/cadence_gem.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
index f9e4091..e513d9d 100644
--- a/hw/net/cadence_gem.c
+++ b/hw/net/cadence_gem.c
@@ -678,6 +678,10 @@  static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
     } else {
         unsigned crc_val;
 
+        if (size > sizeof(rxbuf) - sizeof(crc_val)) {
+            size = sizeof(rxbuf) - sizeof(crc_val);
+        }
+        bytes_to_copy = size;
         /* The application wants the FCS field, which QEMU does not provide.
          * We must try and calculate one.
          */