[Asterisk-code-review] srv: Fix crash when ast srv lookup is used and 0 records are... (asterisk[13])

[Joshua Colp]

Joshua Colp has uploaded a new change for review. ( https://gerrit.asterisk.org/4897 )

Change subject: srv: Fix crash when ast_srv_lookup is used and 0 records are returned.
......................................................................

srv: Fix crash when ast_srv_lookup is used and 0 records are returned.

When performing an SRV lookup using the ast_srv_lookup function it
did not properly handle the situation where 0 records are returned.
If this happened it would wrongly assume that at least one record
was present.

This change fixes the code so it will exit early if an error occurs
or if 0 records are returned.

ASTERISK-26772
patches:
  srv_lookup.patch submitted by nappsoft (license 6822)

Change-Id: I09b19081c74e0ad11c12bf54a257243b1bcb2351
---
M main/srv.c
1 file changed, 2 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/97/4897/1

diff --git a/main/srv.c b/main/srv.c
index 0938a0c..dcfcc2b 100644
--- a/main/srv.c
+++ b/main/srv.c
@@ -211,7 +211,8 @@
 		}
 		AST_LIST_HEAD_INIT_NOLOCK(&(*context)->entries);
 
-		if ((ast_search_dns(*context, service, C_IN, T_SRV, srv_callback)) < 0) {
+		if (((ast_search_dns(*context, service, C_IN, T_SRV, srv_callback)) < 1) ||
+			AST_LIST_EMPTY(&(*context)->entries)) {
 			ast_free(*context);
 			*context = NULL;
 			return -1;

-- 
To view, visit https://gerrit.asterisk.org/4897
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I09b19081c74e0ad11c12bf54a257243b1bcb2351
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Owner: Joshua Colp <jcolp at digium.com>