From: Dmitry V. Levin <ldv@altlinux.org>
Date: Mon, 26 Mar 2012 14:14:50 +0000 (+0000)
Subject: qual_syscall: fix potential NULL dereference
X-Git-Tag: v4.7~31
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4372cc956b7ff1b7e1398d2247e5ac87c4788455;p=strace

qual_syscall: fix potential NULL dereference

Fix regression introduced by commit
c1371ebc400fe9578908beca87f2bf407daf1506

* syscall.c (qual_syscall): Handle null sys_name.

Reported-by: Fr. Br. George <george@altlinux.org>
---

diff --git a/syscall.c b/syscall.c
index cf9cd082..ddc461c7 100644
--- a/syscall.c
+++ b/syscall.c
@@ -345,14 +345,16 @@ qual_syscall(const char *s, int bitflag, int not)
 		return 0;
 	}
 	for (i = 0; i < nsyscalls0; i++)
-		if (strcmp(s, sysent0[i].sys_name) == 0) {
+		if (sysent0[i].sys_name &&
+		    strcmp(s, sysent0[i].sys_name) == 0) {
 			qualify_one(i, bitflag, not, 0);
 			rc = 0;
 		}
 
 #if SUPPORTED_PERSONALITIES >= 2
 	for (i = 0; i < nsyscalls1; i++)
-		if (strcmp(s, sysent1[i].sys_name) == 0) {
+		if (sysent1[i].sys_name &&
+		    strcmp(s, sysent1[i].sys_name) == 0) {
 			qualify_one(i, bitflag, not, 1);
 			rc = 0;
 		}
@@ -360,7 +362,8 @@ qual_syscall(const char *s, int bitflag, int not)
 
 #if SUPPORTED_PERSONALITIES >= 3
 	for (i = 0; i < nsyscalls2; i++)
-		if (strcmp(s, sysent2[i].sys_name) == 0) {
+		if (sysent2[i].sys_name &&
+		    strcmp(s, sysent2[i].sys_name) == 0) {
 			qualify_one(i, bitflag, not, 2);
 			rc = 0;
 		}