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| author |   Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-10-04 19:04:22 +0100 |
|---|---|---|
| committer |   Dominique Martinet <asmadeus@codewreck.org> | 2020-10-07 23:57:30 +0200 |
| commit | f5f7ab168b9a60e12a4b8f2bb6fcc91321dc23c1 (patch) | |
| tree | 4b45d50fabc82567e0d5aaadec5d085bca747841 /fs/9p | |
| parent | Linux 5.9-rc8 (diff) | |
| download | linux-dev-f5f7ab168b9a60e12a4b8f2bb6fcc91321dc23c1.tar.xz linux-dev-f5f7ab168b9a60e12a4b8f2bb6fcc91321dc23c1.zip | |
9P: Cast to loff_t before multiplying
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>
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 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), }; |