[openbsc 1/2] rtp_proxy: Prevent out-of-bounds read in rtcp_sdes_cname_mangle

In rtcp_sdes_cname_mangle when skipping over additional zeroes at the end of a chunk we should not read past the actual message (rtcp_end).

Fixes CID #1206579 --- openbsc/src/libtrau/rtp_proxy.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/openbsc/src/libtrau/rtp_proxy.c b/openbsc/src/libtrau/rtp_proxy.c index 122daf2..1567323 100644 --- a/openbsc/src/libtrau/rtp_proxy.c +++ b/openbsc/src/libtrau/rtp_proxy.c @@ -374,7 +374,7 @@ static int rtcp_sdes_cname_mangle(struct msgb *msg, struct rtcp_hdr *rh, tag = *cur++; if (tag == 0) { /* end of chunk, skip additional zero */ - while (*cur++ == 0) { } + while ((*cur++ == 0) && (cur < rtcp_end)) { } break; } len = *cur++;