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9P: Cast to loff_t before multiplying
commit f5f7ab1 upstream. On 32-bit systems, this multiplication will overflow for files larger than 4GB. Link: http://lkml.kernel.org/r/20201004180428.14494-2-willy@infradead.org Cc: stable@vger.kernel.org Fixes: fb89b45 ("9P: introduction of a new cache=mmap model.") Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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