summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMatthew Wilcox (Oracle) <willy@infradead.org>2020-10-04 19:04:22 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-11-05 11:08:53 +0100
commitf870895527ae8dde12309583ebe3e5b0a3ecb8d2 (patch)
treea4e290bcc326989390297c67ae8ad2893dc29abc
parent416ea9783571eedcabdc9247653518e1005eca73 (diff)
downloadlinux-stable-f870895527ae8dde12309583ebe3e5b0a3ecb8d2.tar.gz
linux-stable-f870895527ae8dde12309583ebe3e5b0a3ecb8d2.tar.bz2
linux-stable-f870895527ae8dde12309583ebe3e5b0a3ecb8d2.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>
-rw-r--r--fs/9p/vfs_file.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 550d0b169d7c..61e0c552083f 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),
};