[uml-devel] [Patch] arch/um/os-Linux/main.c: Fix memory leaks.

[uml-devel] [Patch] arch/um/os-Linux/main.c: Fix memory leaks.

[WANG Cong]

This patch fixes possible memory leaks in the main() function of
arch/um/os-Linux/main.c.

Cc: jdike@addtoit.com
Signed-off-by: WANG Cong <wangcong@zeuux.org>

---

Index: linux-2.6/arch/um/os-Linux/main.c
===================================================================
--- linux-2.6.orig/arch/um/os-Linux/main.c
+++ linux-2.6/arch/um/os-Linux/main.c
@@ -113,14 +113,10 @@ static void setup_env_path(void)
 
 extern void scan_elf_aux( char **envp);
 
-int __init main(int argc, char **argv, char **envp)
+static char** dup_argv(int argc, char **argv)
 {
+	int i;
 	char **new_argv;
-	int ret, i, err;
-
-	set_stklim();
-
-	setup_env_path();
 
 	new_argv = malloc((argc + 1) * sizeof(char *));
 	if (new_argv == NULL) {
@@ -135,6 +131,28 @@ int __init main(int argc, char **argv, c
 		}
 	}
 	new_argv[argc] = NULL;
+	return new_argv;
+}
+
+static void free_argv(int argc, char **argv)
+{
+	int i;
+	for (i = 0; i < argc; i++) {
+		free(argv[i]);
+	}
+	free(argv);
+}
+
+int __init main(int argc, char **argv, char **envp)
+{
+	char **new_argv;
+	int ret, i, err;
+
+	set_stklim();
+
+	setup_env_path();
+
+	new_argv = dup_argv(argc, argv);
 
 	/*
 	 * Allow these signals to bring down a UML if all other
@@ -185,6 +203,7 @@ int __init main(int argc, char **argv, c
 		perror("Failed to exec kernel");
 		ret = 1;
 	}
+	free_argv(argc, new_argv);
 	printf("\n");
 	return uml_exitcode;
 }

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Re: [uml-devel] [Patch] arch/um/os-Linux/main.c: Fix memory leaks.

[Jeff Dike]

On Tue, Apr 01, 2008 at 11:06:41PM +0800, WANG Cong wrote:
> 
> This patch fixes possible memory leaks in the main() function of
> arch/um/os-Linux/main.c.

I'm somewhat dubious about this - the memory is freed immediately
before exiting, making this patch have no practical effect.

       		       	    Jeff

-- 
Work email - jdike at linux dot intel dot com

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Re: [uml-devel] [Patch] arch/um/os-Linux/main.c: Fix memory leaks.

[WANG Cong]

From: Jeff Dike <jdike@addtoit.com>
Date: Fri, 4 Apr 2008 11:49:01 -0400

> On Tue, Apr 01, 2008 at 11:06:41PM +0800, WANG Cong wrote:
> > 
> > This patch fixes possible memory leaks in the main() function of
> > arch/um/os-Linux/main.c.
> 
> I'm somewhat dubious about this - the memory is freed immediately
> before exiting, making this patch have no practical effect.
> 

I think all memory leaks indicate our logic is not right, although
this one maybe harmless.

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