From: Kent Overstreet <kent.overstreet@linux.dev>
Date: Wed, 20 Sep 2023 02:26:18 +0000 (-0400)
Subject: bcachefs: bch2_ioctl_disk_resize_journal(): check for integer truncation
X-Git-Tag: microblaze-v6.8~204^2~39
X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=4b33a1916a351ba3bf5af42fb38a988a5dce11bf;p=linux-2.6-microblaze.git

bcachefs: bch2_ioctl_disk_resize_journal(): check for integer truncation

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
---

diff --git a/fs/bcachefs/chardev.c b/fs/bcachefs/chardev.c
index 51d671267741..e8b6733e7f71 100644
--- a/fs/bcachefs/chardev.c
+++ b/fs/bcachefs/chardev.c
@@ -627,6 +627,9 @@ static long bch2_ioctl_disk_resize_journal(struct bch_fs *c,
 	    arg.pad)
 		return -EINVAL;
 
+	if (arg.nbuckets > U32_MAX)
+		return -EINVAL;
+
 	ca = bch2_device_lookup(c, arg.dev, arg.flags);
 	if (IS_ERR(ca))
 		return PTR_ERR(ca);