From: Sven Eckelmann <sven@narfation.org>
To: b.a.t.m.a.n@lists.open-mesh.org
Cc: Sven Eckelmann <sven@narfation.org>
Subject: [PATCH] alfred: Ensure processed change_iface packet is 0-terminated
Date: Sat, 19 Feb 2022 08:54:24 +0100 [thread overview]
Message-ID: <20220219075424.802930-1-sven@narfation.org> (raw)
A client sending a alfred_change_interface_v0 packet to the alfred server
might have forgotten to 0-terminate the string. In this case, strstr in
unix_sock_change_iface might read outside of the available buffer.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
unix_sock.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/unix_sock.c b/unix_sock.c
index bc39199..8c2b762 100644
--- a/unix_sock.c
+++ b/unix_sock.c
@@ -329,6 +329,8 @@ unix_sock_change_iface(struct globals *globals,
if (len < (int)(sizeof(*change_iface) - sizeof(change_iface->header)))
goto err;
+ change_iface->ifaces[sizeof(change_iface->ifaces) - 1] = '\0';
+
if (globals->opmode == OPMODE_SECONDARY) {
if (strstr(change_iface->ifaces, ",") != NULL) {
ret = -EINVAL;
--
2.30.2
reply other threads:[~2022-02-19 7:54 UTC|newest]
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