From: Heinrich Schuchardt <xypron.glpk@gmx.de>
Date: Thu, 16 Apr 2015 19:48:07 +0000 (-0700)
Subject: kernel/sysctl.c: detect overflows when converting to int
X-Git-Tag: omap-for-v4.1/fixes-rc1~115^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=230633d109e35b0a24277498e773edeb79b4a331;p=pandora-kernel.git

kernel/sysctl.c: detect overflows when converting to int

When converting unsigned long to int overflows may occur.  These currently
are not detected when writing to the sysctl file system.

E.g. on a system where int has 32 bits and long has 64 bits
  echo 0x800001234 > /proc/sys/kernel/threads-max
has the same effect as
  echo 0x1234 > /proc/sys/kernel/threads-max

The patch adds the missing check in do_proc_dointvec_conv.

With the patch an overflow will result in an error EINVAL when writing to
the the sysctl file system.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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