[Asterisk-code-review] acl.c: Coerce a NULL pointer into the empty string (asterisk[18])

[George Joseph]

George Joseph has submitted this change. ( https://gerrit.asterisk.org/c/asterisk/+/14663 )

Change subject: acl.c: Coerce a NULL pointer into the empty string
......................................................................

acl.c: Coerce a NULL pointer into the empty string

If an ACL is misconfigured in the realtime database (for instance, the
"rule" is blank) and Asterisk attempts to read the ACL, Asterisk will
crash.

ASTERISK-28978 #close

Change-Id: Ic1536c4df856231bfd2da00128f7822224d77610
---
M main/acl.c
1 file changed, 1 insertion(+), 1 deletion(-)

Approvals:
  Joshua Colp: Looks good to me, but someone else must approve
  George Joseph: Looks good to me, approved; Approved for Submit



diff --git a/main/acl.c b/main/acl.c
index a560046..2a40fae 100644
--- a/main/acl.c
+++ b/main/acl.c
@@ -578,7 +578,7 @@
 	struct ast_ha *ha;
 	struct ast_ha *prev = NULL;
 	struct ast_ha *ret;
-	char *tmp, *list = ast_strdupa(stuff);
+	char *tmp, *list = ast_strdupa(stuff ?: "");
 	char *address = NULL, *mask = NULL;
 	int addr_is_v4;
 	int allowing = strncasecmp(sense, "p", 1) ? AST_SENSE_DENY : AST_SENSE_ALLOW;

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Gerrit-Project: asterisk
Gerrit-Branch: 18
Gerrit-Change-Id: Ic1536c4df856231bfd2da00128f7822224d77610
Gerrit-Change-Number: 14663
Gerrit-PatchSet: 2
Gerrit-Owner: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-Reviewer: Sean Bright <sean.bright at gmail.com>
Gerrit-MessageType: merged
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