[Asterisk-code-review] app_voicemail_odbc: Fix string overflow warning. (asterisk[20])

[George Joseph]

George Joseph has submitted this change. ( https://gerrit.asterisk.org/c/asterisk/+/19729 )

Change subject: app_voicemail_odbc: Fix string overflow warning.
......................................................................

app_voicemail_odbc: Fix string overflow warning.

Fixes a negative offset warning by initializing
the buffer to empty.

Additionally, although it doesn't currently complain
about it, the size of a buffer is increased to
accomodate the maximum size contents it could have.

ASTERISK-30240 #close

Change-Id: I8eecedf14d3f2a75864797f802277cac89a32877
---
M apps/app_voicemail.c
1 file changed, 22 insertions(+), 3 deletions(-)

Approvals:
  George Joseph: Looks good to me, approved; Approved for Submit




diff --git a/apps/app_voicemail.c b/apps/app_voicemail.c
index 1aca59b..88dc342 100644
--- a/apps/app_voicemail.c
+++ b/apps/app_voicemail.c
@@ -4484,15 +4484,16 @@
  */
 static int remove_file(char *dir, int msgnum)
 {
-	char fn[PATH_MAX];
-	char full_fn[PATH_MAX];
+	char fn[PATH_MAX] = "";
+	char full_fn[PATH_MAX + 4]; /* Plus .txt */
 	char msgnums[80];
 
 	if (msgnum > -1) {
 		snprintf(msgnums, sizeof(msgnums), "%d", msgnum);
 		make_file(fn, sizeof(fn), dir, msgnum);
-	} else
+	} else {
 		ast_copy_string(fn, dir, sizeof(fn));
+	}
 	ast_filedelete(fn, NULL);
 	snprintf(full_fn, sizeof(full_fn), "%s.txt", fn);
 	unlink(full_fn);

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Gerrit-Project: asterisk
Gerrit-Branch: 20
Gerrit-Change-Id: I8eecedf14d3f2a75864797f802277cac89a32877
Gerrit-Change-Number: 19729
Gerrit-PatchSet: 2
Gerrit-Owner: N A <asterisk at phreaknet.org>
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-MessageType: merged
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