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msm-5.4: CPE crash during SIP call

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- Reset skb->len and skb->tail before skb_split.
- Use skb_nfct() helper instead of skb->_nfct.

Change-Id: I62f2ade5ebb4ecd197325e520223df4d6f6eff78
Signed-off-by: Dheeraj Kumar <quic_dhekum@quicinc.com>
This commit is contained in:
Dheeraj Kumar 2022-04-07 14:31:58 +05:30
parent b48d25e6ca
commit 9f2ad37e93
1 changed files with 5 additions and 2 deletions
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7
net/netfilter/nf_conntrack_sip.c
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@ -293,7 +293,7 @@ static void recalc_header(struct sk_buff *skb, unsigned int skblen,
struct tcphdr *tcph;
/* here we recalculate ip and tcp headers */
if (nf_ct_l3num((struct nf_conn *)skb->_nfct) == NFPROTO_IPV4) {
if (nf_ct_l3num((struct nf_conn *)skb_nfct(skb)) == NFPROTO_IPV4) {
/* fix IP hdr checksum information */
ip_hdr(skb)->tot_len = htons(skblen);
ip_send_check(ip_hdr(skb));
@ -303,7 +303,7 @@ static void recalc_header(struct sk_buff *skb, unsigned int skblen,
}
datalen = skb->len - protoff;
tcph = (struct tcphdr *)((void *)skb->data + protoff);
nf_nat_csum_recalc(skb, nf_ct_l3num((struct nf_conn *)skb->_nfct),
nf_nat_csum_recalc(skb, nf_ct_l3num((struct nf_conn *)skb_nfct(skb)),
IPPROTO_TCP, tcph, &tcph->check, datalen, oldlen);
}
@ -1913,6 +1913,9 @@ static void sip_tcp_skb_combined_processing(bool skb_is_combined, struct sk_buff
splitlen = (dir == IP_CT_DIR_ORIGINAL) ?
ct->segment.skb_len[0] : ct->segment.skb_len[1];
oldlen = combined_skb->len - protoff;
/* Reset skb->len and skb->tail params before skb split. */
skb->len = 0;
skb->tail = skb->data;
skb_split(combined_skb, skb, splitlen);
/* Headers need to be recalculated since during SIP processing
* headers are calculated based on the change in length of the