Properly check the capabilities count to avoid a segfault.

(ASA-2007-019)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@78375 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_skinny.c b/channels/chan_skinny.c
index 2bde2e2d836a80487a7d54ec21a2969023929cbd..3bbc1bae2823a91230af8dffa1efa2c527407dad 100644 (file)
--- a/channels/chan_skinny.c
+++ b/channels/chan_skinny.c
@@ -202,9 +202,11 @@ struct station_capabilities {
        } payloads;
 };
 
+#define SKINNY_MAX_CAPABILITIES 18
+
 struct capabilities_res_message {
        uint32_t count;
-       struct station_capabilities caps[18];
+       struct station_capabilities caps[SKINNY_MAX_CAPABILITIES];
 };
 
 #define SPEED_DIAL_STAT_REQ_MESSAGE 0x000A
@@ -3459,11 +3461,15 @@ static int handle_capabilities_res_message(struct skinny_req *req, struct skinny
 {
        struct skinny_device *d = s->device;
        struct skinny_line *l;
-       int count = 0;
+       uint32_t count = 0;
        int codecs = 0;
        int i;
 
        count = letohl(req->data.caps.count);
+       if (count > SKINNY_MAX_CAPABILITIES) {
+               count = SKINNY_MAX_CAPABILITIES;
+               ast_log(LOG_WARNING, "Received more capabilities than we can handle (%d).  Ignoring the rest.\n", SKINNY_MAX_CAPABILITIES);
+       }
 
        for (i = 0; i < count; i++) {
                int acodec = 0;