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Test the value of msg_controllen for platforms whose CMSG_FIRSTHDR() does not test it for us 

As RFC 2292 points out, some platforms (e.g. Darwin 9.8.0) provide
CMSG_FIRSTHDR(msg) which just returns msg.msg_control without first
checking if msg.msg_controllen is non-zero. We need a workaround for
such platforms not to let _xcb_in_read() segfault.

https://bugs.freedesktop.org/show_bug.cgi?id=72253

Signed-off-by: Julien Cristau <jcristau@debian.org>
This commit is contained in:
PHO 2013-12-03 12:43:04 +09:00 committed by Julien Cristau
parent b30b11ac49
commit a1299eb2a2
1 changed files with 7 additions and 5 deletions
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2
src/xcb_in.c
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@ -918,6 +918,7 @@ int _xcb_in_read(xcb_connection_t *c)
#if HAVE_SENDMSG
struct cmsghdr *hdr;
if (msg.msg_controllen >= sizeof (struct cmsghdr)) {
for (hdr = CMSG_FIRSTHDR(&msg); hdr; hdr = CMSG_NXTHDR(&msg, hdr)) {
if (hdr->cmsg_level == SOL_SOCKET && hdr->cmsg_type == SCM_RIGHTS) {
int nfd = (hdr->cmsg_len - CMSG_LEN(0)) / sizeof (int);
@ -925,6 +926,7 @@ int _xcb_in_read(xcb_connection_t *c)
c->in.in_fd.nfd += nfd;
}
}
}
#endif
c->in.queue_len += n;
}