From: Corey Minyard <minyard@acm.org>
Date: Tue, 21 Jan 2014 23:48:44 +0000 (-0800)
Subject: fs/read_write.c:compat_readv(): remove bogus area verify
X-Git-Tag: v3.14-rc1~134^2~92
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4e4f9e66a75921aa260c2f5bf626bdea54e51ba2;p=pandora-kernel.git

fs/read_write.c:compat_readv(): remove bogus area verify

The compat_do_readv_writev() function was doing a verify_area on the
incoming iov, but the nr_segs value is not checked.  If someone passes
in a -1 for nr_segs, for instance, the function should return an EINVAL.
However, it returns a EFAULT because the verify_area fails because it is
checking an array of size MAX_UINT.  The check is bogus, anyway, because
the next check, compat_rw_copy_check_uvector(), will do all the
necessary checking, anyway.  The non-compat do_readv_writev() function
doesn't do this check, so I think it's safe to just remove the code.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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