linux-ext4 - [PATCH] e2fsprogs: fix potential null ptr defef in check_for

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Date:	Tue, 24 Feb 2009 15:13:39 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: [PATCH] e2fsprogs: fix potential null ptr defef in check_for_modules()

The coverity scanner found this one.

If a line in modules.dep has a ":" but no "/" then:

                if ((cp = strchr(buf, ':')) != NULL)
                        *cp = 0;
                else
                        continue;
                if ((cp = strrchr(buf, '/')) != NULL)
                        cp++;
                /* XXX else cp is still null */
                i = strlen(cp);

... we will deref a null pointer (cp).  This can be 
demonstrated by putting a line like:

foo.ko:

into modules.dep.  The below change just says that if no "/" is
found, treat the whole string as the module name.

Signed-off-by: Eric Sandeen <sandeen@...hat.com>
---

Index: e2fsprogs/e2fsck/util.c
===================================================================
--- e2fsprogs.orig/e2fsck/util.c
+++ e2fsprogs/e2fsck/util.c
@@ -663,6 +663,8 @@ int check_for_modules(const char *fs_nam
 			continue;
 		if ((cp = strrchr(buf, '/')) != NULL)
 			cp++;
+		else
+			cp = buf;
 		i = strlen(cp);
 		if (i > 3) {
 			t = cp + i - 3;
Index: e2fsprogs/lib/blkid/probe.c
===================================================================
--- e2fsprogs.orig/lib/blkid/probe.c
+++ e2fsprogs/lib/blkid/probe.c
@@ -227,6 +227,8 @@ static int check_for_modules(const char 
 			continue;
 		if ((cp = strrchr(buf, '/')) != NULL)
 			cp++;
+		else
+			cp = buf;
 		i = strlen(cp);
 		if (i > 3) {
 			t = cp + i - 3;

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