From: DervishD <raul@pleyades.net>
To: Marcelo Tosatti <marcelo@conectiva.com.br>
Cc: Linux-kernel <linux-kernel@vger.kernel.org>
Subject: [TRIVIAL] mmap.c corner case fix
Date: Thu, 9 Jan 2003 15:56:59 +0100 [thread overview]
Message-ID: <20030109145659.GB164@DervishD> (raw)
[-- Attachment #1: Type: text/plain, Size: 282 bytes --]
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-pre1, is just the same.
Raúl
[-- Attachment #2: mmap.c.diff for 2.4.20 and 2.4.21-pre --]
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--- 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? */
reply other threads:[~2003-01-09 14:45 UTC|newest]
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