9P: Cast to loff_t before multiplying
commit5.4-rM2-2.2.x-imx-squashedf5f7ab168b
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:fb89b45cdf
("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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@ -609,9 +609,9 @@ static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
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struct writeback_control wbc = {
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.nr_to_write = LONG_MAX,
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.sync_mode = WB_SYNC_ALL,
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.range_start = vma->vm_pgoff * PAGE_SIZE,
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.range_start = (loff_t)vma->vm_pgoff * PAGE_SIZE,
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/* absolute end, byte at end included */
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.range_end = vma->vm_pgoff * PAGE_SIZE +
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.range_end = (loff_t)vma->vm_pgoff * PAGE_SIZE +
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(vma->vm_end - vma->vm_start - 1),
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};
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