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[iphone] Add missing va_start()/va_end() around reused argument list 

The ipair_tx() function uses a va_list twice (first to calculate the
formatted string length before allocation, then to construct the
string in the allocated buffer) but is missing the va_start() and
va_end() around the second usage.  This is undefined behaviour that
happens to work on some build platforms.

Fix by adding the missing va_start() and va_end() around the second
usage of the variadic argument list.

Reported-by: Andreas Hammarskjöld <andreas@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/1073/head
Michael Brown 2023-10-24 11:43:56 +01:00
parent ff0f860483
commit 115707c0ed
1 changed files with 2 additions and 0 deletions
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2
src/drivers/net/iphone.c
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@ -1304,7 +1304,9 @@ ipair_tx ( struct ipair *ipair, const char *fmt, ... ) {
memset ( hdr, 0, sizeof ( *hdr ) );
hdr->len = htonl ( len );
msg = iob_put ( iobuf, len );
va_start ( args, fmt );
vsnprintf ( msg, len, fmt, args );
va_end ( args );
DBGC2 ( ipair, "IPAIR %p transmitting:\n%s\n", ipair, msg );
/* Transmit message */