From 9046625511ad8dfbc8c6c2de16b3532c43d68d48 Mon Sep 17 00:00:00 2001 From: Jeffrey Mitchell Date: Fri, 26 Feb 2021 15:00:23 -0600 Subject: [Backport 9046625511ad] ecryptfs: fix kernel panic with null dev_name When mounting eCryptfs, a null "dev_name" argument to ecryptfs_mount() causes a kernel panic if the parsed options are valid. The easiest way to reproduce this is to call mount() from userspace with an existing eCryptfs mount's options and a "source" argument of 0. Error out if "dev_name" is null in ecryptfs_mount() Fixes: 237fead61998 ("[PATCH] ecryptfs: fs/Makefile and fs/Kconfig") Cc: stable@vger.kernel.org Signed-off-by: Jeffrey Mitchell Signed-off-by: Tyler Hicks --- src/main.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/main.c b/src/main.c index 77b96737b1ffbdeea6d22294530e85ce05464dde..d66bbd2df191e5cf69310243a711dd341e3822c7 100644 --- a/src/main.c +++ b/src/main.c @@ -492,6 +492,12 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags goto out; } + if (!dev_name) { + rc = -EINVAL; + err = "Device name cannot be null"; + goto out; + } + rc = ecryptfs_parse_options(sbi, raw_data, &check_ruid); if (rc) { err = "Error parsing options"; -- 2.31.1