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Subject[PATCH][TRIVIAL] mmap.c corner case fix
    Hi Marcelo :)

This patch fixes a corner case on the mmap() syscall.

The patch is from David S. Miller, not me. My patch was
incomplete and did nothing on 'big TASK_SIZE' architectures.

The patch is against both 2.4.20 and 2.4.21-pre, is just the same.
Please apply. I sent you the incomplete patch at pre-1 and this bug
is getting older by the minute ;))

Thanks :)

Raúl
--- linux/mm/mmap.c.orig 2002-12-11 13:59:37.000000000 +0100
+++ linux/mm/mmap.c 2002-12-11 14:01:16.000000000 +0100
@@ -403,10 +403,12 @@
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)
+ len = PAGE_ALIGN(len);
+
+ if (len > TASK_SIZE || len == 0)
return -EINVAL;

/* offset overflow? */
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