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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-10-04 19:04:22 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-10 10:23:59 +0100 |
| commit | ddfff3b4c98ed328ab7298eec948968623c322ab (patch) | |
| tree | 15252a5acadbbfa41987e2415cc301eaa9de0f0a /fs/9p | |
| parent | 568b54b91cb90172b335ddc07351a010c467fc7f (diff) | |
| download | linux-stable-ddfff3b4c98ed328ab7298eec948968623c322ab.tar.gz linux-stable-ddfff3b4c98ed328ab7298eec948968623c322ab.tar.bz2 linux-stable-ddfff3b4c98ed328ab7298eec948968623c322ab.zip | |
9P: Cast to loff_t before multiplying
commit f5f7ab168b9a60e12a4b8f2bb6fcc91321dc23c1 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: fb89b45cdfdc ("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>
Diffstat (limited to 'fs/9p')
| -rw-r--r-- | fs/9p/vfs_file.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index e963b83afc71..6be16c74e3e9 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -624,9 +624,9 @@ 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), }; |