diff options
| author | Philipp Stanner <pstanner@redhat.com> | 2023-11-02 20:26:13 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-11-28 16:56:20 +0000 |
| commit | 38ada2f304f6f2065dd59613ef236a26f4dd73cd (patch) | |
| tree | 422e9fd001cefcb1fd7c3b81472c5ce4910a26b9 /drivers/i2c | |
| parent | 610244988f327d34295f4317df0017ce3a229261 (diff) | |
i2c: dev: copy userspace array safely
[ Upstream commit cc9c54232f04aef3a5d7f64a0ece7df00f1aaa3d ]
i2c-dev.c utilizes memdup_user() to copy a userspace array. This is done
without an overflow check.
Use the new wrapper memdup_array_user() to copy the array more safely.
Suggested-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-dev.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index 6fd2b6718b08..9fefceb3a95d 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -450,8 +450,8 @@ static long i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS) return -EINVAL; - rdwr_pa = memdup_user(rdwr_arg.msgs, - rdwr_arg.nmsgs * sizeof(struct i2c_msg)); + rdwr_pa = memdup_array_user(rdwr_arg.msgs, + rdwr_arg.nmsgs, sizeof(struct i2c_msg)); if (IS_ERR(rdwr_pa)) return PTR_ERR(rdwr_pa); |