diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-10-04 19:04:22 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-10 10:22:17 +0100 |
| commit | 68c3ab8037cbe953638bffcbf097b8fbd480ba37 (patch) | |
| tree | a9af6c2e026bed595e43c70282169407537b3879 /fs/9p | |
| parent | a1f0137aec9c83e881b3d53958ae2416834311a4 (diff) | |
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 9dbf37147126..b5aa3e005b9e 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), }; |