tree a693416656084c99581c8ef6d2ca830b0cfe13a9
parent 8ae0b77811d97552b3b3c745e97de18849583bf7
author Badari Pulavarty <pbadari@us.ibm.com> 1119736542 -0700
committer Linus Torvalds <torvalds@ppc970.osdl.org> 1119741879 -0700

[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>