PARISC: led.c - fix potential stack overflow in led_proc_write()
Helge Deller [Mon, 2 Aug 2010 20:46:41 +0000 (22:46 +0200)]
avoid potential stack overflow by correctly checking count parameter

Reported-by: Ilja <ilja@netric.org>
Signed-off-by: Helge Deller <deller@gmx.de>
Acked-by: Kyle McMartin <kyle@mcmartin.ca>
Cc: James E.J. Bottomley <jejb@parisc-linux.org>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/parisc/led.c

index 188bc84..d02be78 100644 (file)
@@ -176,16 +176,18 @@ static ssize_t led_proc_write(struct file *file, const char *buf,
        size_t count, loff_t *pos)
 {
        void *data = PDE(file->f_path.dentry->d_inode)->data;
-       char *cur, lbuf[count + 1];
+       char *cur, lbuf[32];
        int d;
 
        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;
 
-       memset(lbuf, 0, count + 1);
+       if (count >= sizeof(lbuf))
+               count = sizeof(lbuf)-1;
 
        if (copy_from_user(lbuf, buf, count))
                return -EFAULT;
+       lbuf[count] = 0;
 
        cur = lbuf;