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[PATCH] fix for generic_file_write iov problem

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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>
This commit is contained in:
Badari Pulavarty 2005-06-25 14:55:42 -07:00 committed by Linus Torvalds
parent 8ae0b77811
commit b0cfbd995d
1 changed files with 3 additions and 1 deletions
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mm/filemap.c
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@ -1954,7 +1954,9 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
if (unlikely(nr_segs > 1)) {
filemap_set_next_iovec(&cur_iov,
&iov_base, status);
buf = cur_iov->iov_base + iov_base;
if (count)
buf = cur_iov->iov_base +
iov_base;
} else {
iov_base += status;
}