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e1000: Fix TCP checksum overflow with TSO

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When adding the length to the pseudo header, we're not properly
accounting for overflow.

From: Mark Wu <dwu@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Alex Williamson 2010-11-05 14:52:08 -06:00 • committed by Michael S. Tsirkin
parent a5fd2c345f
commit e685b4eb64
1 changed files with 4 additions and 1 deletions
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5
hw/e1000.c
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@ -384,9 +384,12 @@ xmit_seg(E1000State *s)
} else // UDP } else // UDP
cpu_to_be16wu((uint16_t *)(tp->data+css+4), len); cpu_to_be16wu((uint16_t *)(tp->data+css+4), len);
if (tp->sum_needed & E1000_TXD_POPTS_TXSM) { if (tp->sum_needed & E1000_TXD_POPTS_TXSM) {
unsigned int phsum;
// add pseudo-header length before checksum calculation // add pseudo-header length before checksum calculation
sp = (uint16_t *)(tp->data + tp->tucso); sp = (uint16_t *)(tp->data + tp->tucso);
cpu_to_be16wu(sp, be16_to_cpup(sp) + len); phsum = be16_to_cpup(sp) + len;
phsum = (phsum >> 16) + (phsum & 0xffff);
cpu_to_be16wu(sp, phsum);
} }
tp->tso_frames++; tp->tso_frames++;
} }