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app_followme.c: Grab reference on nativeformats before using it

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Fixes a crash due to a lack of proper reference on the nativeformats
object before passing it into ast_request().  Also found potentially
similar use case bugs in app_chanisavail.c, bridge.c, and bridge_basic.c

Fixes: #388
(cherry picked from commit b5c31b55c9)
This commit is contained in:
Matthew Fredrickson
2023-10-25 21:14:48 -05:00
committed by Asterisk Development Team
parent 04764945cf
commit 8c71aefa04
4 changed files with 49 additions and 10 deletions
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21
main/bridge.c
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@@ -4118,10 +4118,18 @@ static enum ast_transfer_result blind_transfer_bridge(int is_external,
struct ast_channel *local;
char chan_name[AST_MAX_EXTENSION + AST_MAX_CONTEXT + 2];
int cause;
struct ast_format_cap *caps;
ast_channel_lock(transferer);
caps = ao2_bump(ast_channel_nativeformats(transferer));
ast_channel_unlock(transferer);
snprintf(chan_name, sizeof(chan_name), "%s@%s", exten, context);
local = ast_request("Local", ast_channel_nativeformats(transferer), NULL, transferer,
local = ast_request("Local", caps, NULL, transferer,
chan_name, &cause);
ao2_cleanup(caps);
if (!local) {
return AST_BRIDGE_TRANSFER_FAIL;
}
@@ -4228,9 +4236,16 @@ static enum ast_transfer_result attended_transfer_bridge(struct ast_channel *cha
int cause;
int res;
const char *app = NULL;
struct ast_format_cap *caps;
ast_channel_lock(chan1);
caps = ao2_bump(ast_channel_nativeformats(chan1));
ast_channel_unlock(chan1);
local_chan = ast_request("Local", caps, NULL, chan1, dest, &cause);
ao2_cleanup(caps);
local_chan = ast_request("Local", ast_channel_nativeformats(chan1), NULL, chan1,
dest, &cause);
if (!local_chan) {
return AST_BRIDGE_TRANSFER_FAIL;
}