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vquic: do_sendmsg full init

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When passing a `msg_ctrl` to sendmsg() as part of GSO handling, zero the
complete array. This fixes any false positives by valgrind that complain
about uninitialised memory, even though the kernel only ever accesses
the first two bytes.

Reported-by: Aleksei Bavshin
Fixes #19714
Closes #19715
This commit is contained in:
Stefan Eissing 2025-11-27 10:23:43 +01:00 • committed by Daniel Stenberg
parent 9bb5c0578b
commit a9e7a027ed
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lib/vquic/vquic.c
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@ -145,6 +145,7 @@ static CURLcode do_sendmsg(struct Curl_cfilter *cf,
if(pktlen > gsolen) {
/* Only set this, when we need it. macOS, for example,
* does not seem to like a msg_control of length 0. */
memset(msg_ctrl, 0, sizeof(msg_ctrl));
msg.msg_control = msg_ctrl;
assert(sizeof(msg_ctrl) >= CMSG_SPACE(sizeof(int)));
msg.msg_controllen = CMSG_SPACE(sizeof(int));