fs/btrfs: Integer overflow in btrfs_ioctl_resize()
The local variable 'new_size' comes from userspace. If a large number
was passed, there would be an integer overflow in the following line:
new_size = old_size + new_size;
Signed-off-by: Wenliang Fan <fanwlexca@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index edf5f00..ed3edc283 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1474,6 +1474,10 @@
}
new_size = old_size - new_size;
} else if (mod > 0) {
+ if (new_size > ULLONG_MAX - old_size) {
+ ret = -EINVAL;
+ goto out_free;
+ }
new_size = old_size + new_size;
}