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    Subject[PATCH 1/7] 9P: Cast to loff_t before multiplying
    Date
    On 32-bit systems, this multiplication will overflow for files larger
    than 4GB.

    Cc: stable@vger.kernel.org
    Fixes: fb89b45cdfdc ("9P: introduction of a new cache=mmap model.")
    Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    ---
    fs/9p/vfs_file.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
    index 3576123d8299..6d97b6b4d34b 100644
    --- a/fs/9p/vfs_file.c
    +++ b/fs/9p/vfs_file.c
    @@ -612,9 +612,9 @@ static void v9fs_mmap_vm_close(struct vm_area_struct *vma)
    struct writeback_control wbc = {
    .nr_to_write = LONG_MAX,
    .sync_mode = WB_SYNC_ALL,
    - .range_start = vma->vm_pgoff * PAGE_SIZE,
    + .range_start = (loff_t)vma->vm_pgoff * PAGE_SIZE,
    /* absolute end, byte at end included */
    - .range_end = vma->vm_pgoff * PAGE_SIZE +
    + .range_end = (loff_t)vma->vm_pgoff * PAGE_SIZE +
    (vma->vm_end - vma->vm_start - 1),
    };

    --
    2.28.0
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