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vquic: init for every call to recvmsg

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When calling recvmsg(), always set up the msg structures for
each call as there are OS implemenations that change members
of msg.

Fixes #17120
Reported-by: Harry Sintonen
Closes #17131
This commit is contained in:
Stefan Eissing 2025-04-22 13:12:24 +02:00 committed by Daniel Stenberg
parent 2de9a97141
commit 4872dafd80
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GPG Key ID: 5CC908FDB71E12C2
1 changed files with 10 additions and 8 deletions
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18
lib/vquic/vquic.c
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@ -481,19 +481,21 @@ static CURLcode recvmsg_packets(struct Curl_cfilter *cf,
size_t pktlen;
size_t offset, to;
msg_iov.iov_base = buf;
msg_iov.iov_len = (int)sizeof(buf);
memset(&msg, 0, sizeof(msg));
msg.msg_iov = &msg_iov;
msg.msg_iovlen = 1;
msg.msg_control = msg_ctrl;
DEBUGASSERT(max_pkts > 0);
for(pkts = 0, total_nread = 0; pkts < max_pkts;) {
/* fully initialise this on each call to `recvmsg()`. There are
* operating systems out there that mess with `msg_iov.iov_len`
* in the call (*staring at NetBSD*). */
memset(&msg, 0, sizeof(msg));
msg_iov.iov_base = buf;
msg_iov.iov_len = (int)sizeof(buf);
msg.msg_iov = &msg_iov;
msg.msg_iovlen = 1;
msg.msg_control = msg_ctrl;
msg.msg_name = &remote_addr;
msg.msg_namelen = sizeof(remote_addr);
msg.msg_controllen = sizeof(msg_ctrl);
while((nread = recvmsg(qctx->sockfd, &msg, 0)) == -1 &&
SOCKERRNO == SOCKEINTR)
;