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Fix bug #54506 (LWIP_CHECKSUM_ON_COPY causes wrong checksum (0xFFFF))

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one's complement sum was not correctly done, which could result in the
checksum being 0xFFFF instead of 0 in some cases.
This commit is contained in:
Simon Goldschmidt 2018-09-12 21:56:16 +02:00
parent cdfa3dfa9d
commit bc48eb512e
1 changed files with 2 additions and 2 deletions
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4
src/core/tcp_out.c
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@ -1585,8 +1585,8 @@ tcp_output_segment(struct tcp_seg *seg, struct tcp_pcb *pcb, struct netif *netif
seg->chksum = SWAP_BYTES_IN_WORD(seg->chksum);
seg->chksum_swapped = 0;
}
acc += (u16_t)~(seg->chksum);
seg->tcphdr->chksum = FOLD_U32T(acc);
acc = (u16_t)~acc + seg->chksum;
seg->tcphdr->chksum = (u16_t)~FOLD_U32T(acc);
#if TCP_CHECKSUM_ON_COPY_SANITY_CHECK
if (chksum_slow != seg->tcphdr->chksum) {
TCP_CHECKSUM_ON_COPY_SANITY_CHECK_FAIL(