[PATCH] libosmo-netif[master]: src: _snprintf() helper functions nul-terminate buffers, if ...

[Pablo Neira Ayuso]

Hello Pau Espin Pedrol, Jenkins Builder,

I'd like you to reexamine a change.  Please visit

    https://gerrit.osmocom.org/3830

to look at the new patch set (#3).

src: _snprintf() helper functions nul-terminate buffers, if possible

This patch inconditionally initializes the buffer we get to
nul-terminate it, whenever possible. It's a very simple solution to
catch three overly corner cases:

1) snprintf() returns -1, very much unlikely in practise.

2) msg->len == 0: In such case, I would expect this function is never
   called with an empty message, but let's be safe in this case too.

3) If your buffer is empty, it doesn't nul-terminate the buffer.

Change-Id: I97e517f2d98e83894ea707c63489559302ff6bd2
---
M src/osmux.c
M src/rtp.c
2 files changed, 6 insertions(+), 0 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/libosmo-netif refs/changes/30/3830/3

diff --git a/src/osmux.c b/src/osmux.c
index b18246f..7290d99 100644
--- a/src/osmux.c
+++ b/src/osmux.c
@@ -902,6 +902,9 @@
 	int msg_len = msg->len;
 	int ret;
 
+	if (size)
+		buf[0] = '\0';
+
 	while (msg_len > 0) {
 		if (msg_len < sizeof(struct osmux_hdr)) {
 			LOGP(DLMIB, LOGL_ERROR,
diff --git a/src/rtp.c b/src/rtp.c
index 56fc37c..48cb9b0 100644
--- a/src/rtp.c
+++ b/src/rtp.c
@@ -200,6 +200,9 @@
 	uint8_t *payload;
 	int ret, i;
 
+	if (size)
+		buf[0] = '\0';
+
 	rtph = osmo_rtp_get_hdr(msg);
 	if (rtph == NULL)
 		return -1;

-- 
To view, visit https://gerrit.osmocom.org/3830
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I97e517f2d98e83894ea707c63489559302ff6bd2
Gerrit-PatchSet: 3
Gerrit-Project: libosmo-netif
Gerrit-Branch: master
Gerrit-Owner: Pablo Neira Ayuso <pablo at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: Pablo Neira Ayuso <pablo at gnumonks.org>
Gerrit-Reviewer: Pau Espin Pedrol <pespin at sysmocom.de>