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Subject[PATCH AUTOSEL 5.5 539/542] fuse: don't overflow LLONG_MAX with end offset
Date
From: Miklos Szeredi <mszeredi@redhat.com>

[ Upstream commit 2f1398291bf35fe027914ae7a9610d8e601fbfde ]

Handle the special case of fuse_readpages() wanting to read the last page
of a hugest file possible and overflowing the end offset in the process.

This is basically to unbreak xfstests:generic/525 and prevent filesystems
from doing bad things with an overflowing offset.

Reported-by: Xiao Yang <ice_yangxiao@163.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/fuse/file.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 695369f46f92d..3dd37a998ea93 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -803,6 +803,10 @@ static int fuse_do_readpage(struct file *file, struct page *page)

attr_ver = fuse_get_attr_version(fc);

+ /* Don't overflow end offset */
+ if (pos + (desc.length - 1) == LLONG_MAX)
+ desc.length--;
+
fuse_read_args_fill(&ia, file, pos, desc.length, FUSE_READ);
res = fuse_simple_request(fc, &ia.ap.args);
if (res < 0)
@@ -888,6 +892,14 @@ static void fuse_send_readpages(struct fuse_io_args *ia, struct file *file)
ap->args.out_pages = true;
ap->args.page_zeroing = true;
ap->args.page_replace = true;
+
+ /* Don't overflow end offset */
+ if (pos + (count - 1) == LLONG_MAX) {
+ count--;
+ ap->descs[ap->num_pages - 1].length--;
+ }
+ WARN_ON((loff_t) (pos + count) < 0);
+
fuse_read_args_fill(ia, file, pos, count, FUSE_READ);
ia->read.attr_ver = fuse_get_attr_version(fc);
if (fc->async_read) {
--
2.20.1
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