From: Badari Pulavarty <pbadari@us.ibm.com>
Date: Sat, 25 Jun 2005 21:55:42 +0000 (-0700)
Subject: [PATCH] fix for generic_file_write iov problem
X-Git-Tag: v2.6.13-rc1~68^2~162
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b0cfbd995d091b10841eeb948976f5d1fbf13cdd;p=pandora-kernel.git

[PATCH] fix for generic_file_write iov problem

Here is the fix for the problem described in

	http://bugzilla.kernel.org/show_bug.cgi?id=4721

Basically, problem is generic_file_buffered_write() is accessing beyond end
of the iov[] vector after handling the last vector.  If we happen to cross
page boundary, we get a fault.

I think this simple patch is good enough.  If we really don't want to
depend on the "count", then we need pass nr_segs to
filemap_set_next_iovec() and decrement it and check it.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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