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res_agi: Prevent crash when SET VARIABLE called without arguments

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Explicitly check that the appropriate number of arguments were passed to
SET VARIABLE before attempting to reference them. Also initialize the
arguments array to zeroes before populating it.

ASTERISK-22432 #close

Change-Id: I5143607d80a2724f749c1674f3126b04ed32ea97
This commit is contained in:
Sean Bright
2017-05-23 14:06:22 -04:00
parent dece2eb892
commit 3dcb3c88aa
1 changed files with 5 additions and 1 deletions
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6
res/res_agi.c
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@@ -3183,6 +3183,10 @@ static int handle_channelstatus(struct ast_channel *chan, AGI *agi, int argc, co
static int handle_setvariable(struct ast_channel *chan, AGI *agi, int argc, const char * const argv[])
{
if (argc != 4) {
return RESULT_SHOWUSAGE;
}
if (argv[3])
pbx_builtin_setvar_helper(chan, argv[2], argv[3]);
@@ -4001,7 +4005,7 @@ static void publish_async_exec_end(struct ast_channel *chan, int command_id, con
static enum agi_result agi_handle_command(struct ast_channel *chan, AGI *agi, char *buf, int dead)
{
const char *argv[MAX_ARGS];
const char *argv[MAX_ARGS] = {0};
int argc = MAX_ARGS;
int res;
agi_command *c;