Dial API: Prevent crash on NULL cap

This prevents a crash in the Dial API triggered by use of the Page()
application where a format capability struct was used before checking
whether it was NULL.

ASTERISK-24074 #close

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@419111 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/main/dial.c b/main/dial.c
index 0955aad0499274219d97cea2e0703a7fcdd2d3e4..afee5eeca653f95aad316b8045bb768b2a8591c0 100644 (file)
--- a/main/dial.c
+++ b/main/dial.c
@@ -300,7 +300,7 @@ static int begin_dial_prerun(struct ast_dial_channel *channel, struct ast_channe
        /* Copy device string over */
        ast_copy_string(numsubst, channel->device, sizeof(numsubst));
 
-       if (ast_format_cap_count(cap)) {
+       if (cap && ast_format_cap_count(cap)) {
                cap_request = cap;
        } else if (chan) {
                cap_request = ast_channel_nativeformats(chan);