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net: rtl8139: limit processing of ring descriptors

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RTL8139 ethernet controller in C+ mode supports multiple
descriptor rings, each with maximum of 64 descriptors. While
processing transmit descriptor ring in 'rtl8139_cplus_transmit',
it does not limit the descriptor count and runs forever. Add
check to avoid it.

Reported-by: Andrew Henderson <hendersa@icculus.org>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Prasad J Pandit 2016-10-21 17:39:29 +05:30 committed by Jason Wang
parent fdda170e50
commit c7c3591669
1 changed files with 1 additions and 1 deletions
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2
hw/net/rtl8139.c
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@ -2350,7 +2350,7 @@ static void rtl8139_cplus_transmit(RTL8139State *s)
{
int txcount = 0;
while (rtl8139_cplus_transmit_one(s))
while (txcount < 64 && rtl8139_cplus_transmit_one(s))
{
++txcount;
}