[PATCH] mmap.c (do_mmap_pgoff) against 2.4.19/2.4.20-pre10, better format.

[DervishD <raul@pleyades.net>]

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    Hi all :))

    This time the patch is 'good looking', as per the warning Russell
issued over the format of the last patch (Thanks Russell ;)))

    Raúl

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--- linux/mm/mmap.c.orig  2002-10-14 11:16:40.000000000 +0200
+++ linux/mm/mmap.c	      2002-10-14 11:19:32.000000000 +0200
@@ -390,6 +390,12 @@
 	return 0;
 }
 
+
+/*
+ *	NOTE: in this function we rely on TASK_SIZE being lower than
+ *	SIZE_MAX-PAGE_SIZE at least. I'm pretty sure that it is.
+ */
+
 unsigned long do_mmap_pgoff(struct file * file, unsigned long addr, unsigned long len,
 	unsigned long prot, unsigned long flags, unsigned long pgoff)
 {
@@ -403,12 +409,14 @@
 	if (file && (!file->f_op || !file->f_op->mmap))
 		return -ENODEV;
 
-	if ((len = PAGE_ALIGN(len)) == 0)
+	if (!len)
 		return addr;
 
 	if (len > TASK_SIZE)
 		return -EINVAL;
 
+	len = PAGE_ALIGN(len);  /* This cannot be zero now */
+
 	/* offset overflow? */
 	if ((pgoff + (len >> PAGE_SHIFT)) < pgoff)
 		return -EINVAL;