Commit ff8147fe authored Sep 22, 2009 by Julia Lawall Committed by Linus Torvalds Sep 23, 2009

drivers/video: add kmalloc NULL tests

Check that the result of kmalloc is not NULL before passing it to other
functions.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/

)

// <smpl>
@@
expression *x;
identifier f;
constant char *C;
@@

x = \(kmalloc\|kcalloc\|kzalloc\)(...);
... when != x == NULL
    when != x != NULL
    when != (x || ...)
(
kfree(x)
|
f(...,C,...,x,...)
|
*f(...,x,...)
|
*x->f
)
// </smpl>

[akpm@linux-foundation.org: convert to kstrdup() as well]
Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent f7a595e9

drivers/video/au1100fb.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -715,8 +715,11 @@ int au1100fb_setup(char *options)
		}
		/* Mode option (only option that start with digit) */
		else if (isdigit(this_opt[0])) {
		mode = kmalloc(strlen(this_opt) + 1, GFP_KERNEL);
		strncpy(mode, this_opt, strlen(this_opt) + 1);
		mode = kstrdup(this_opt, GFP_KERNEL);
		if (!mode) {
		print_err("memory allocation failed");
		return -ENOMEM;
		}
		}
		/* Unsupported option */
		else {