mirror/lwip
1
0
Fork 0
mirror of https://github.com/lwip-tcpip/lwip.git synced 2024-07-02 19:08:57 +00:00
Code Issues Packages Projects Releases Wiki Activity

icmp6: Fix copying of chained pbuf in reply

Browse Source 
Fixes bug #58553, and the newly added unit test.

The pbuf_take_at loop should probably be made into a pbuf library
function, which would avoid this mistake in the future and provide
a simpler implementation of pbuf_copy.
This commit is contained in:
Erik Ekman 2020-06-24 00:37:42 +02:00
parent dd913250a9
commit 489405839a
1 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
src/core/ipv6/icmp6.c
View File

@ -388,6 +388,7 @@ icmp6_send_response_with_addrs_and_netif(struct pbuf *p, u8_t code, u32_t data,
struct pbuf *q;
struct icmp6_hdr *icmp6hdr;
u16_t datalen = LWIP_MIN(p->tot_len, LWIP_ICMP6_DATASIZE);
u16_t offset;
/* ICMPv6 header + datalen (as much of the offending packet as possible) */
q = pbuf_alloc(PBUF_IP, sizeof(struct icmp6_hdr) + datalen,
@ -405,8 +406,16 @@ icmp6_send_response_with_addrs_and_netif(struct pbuf *p, u8_t code, u32_t data,
icmp6hdr->code = code;
icmp6hdr->data = lwip_htonl(data);
/* copy fields from original packet */
pbuf_take_at(q, p->payload, datalen, sizeof(struct icmp6_hdr));
/* copy fields from original packet (which may be a chain of pbufs) */
offset = sizeof(struct icmp6_hdr);
while (p && datalen) {
u16_t len = LWIP_MIN(datalen, p->len);
err_t res = pbuf_take_at(q, p->payload, datalen, offset);
if (res != ERR_OK) break;
datalen -= len;
offset += len;
p = p->next;
}
/* calculate checksum */
icmp6hdr->chksum = 0;