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| author | Pavel Skripkin <paskripkin@gmail.com> | 2021-12-31 01:47:50 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2021-12-31 14:28:22 +0100 |
| commit | bb436283e25aaf1533ce061605d23a9564447bdf (patch) | |
| tree | e8680ff3596ee9b7f53dc4fbcaeca7d40d98ab07 /drivers/i2c | |
| parent | fc74e0a40e4f9fd0468e34045b0c45bba11dcbb2 (diff) | |
i2c: validate user data in compat ioctl
Wrong user data may cause warning in i2c_transfer(), ex: zero msgs.
Userspace should not be able to trigger warnings, so this patch adds
validation checks for user data in compact ioctl to prevent reported
warnings
Reported-and-tested-by: syzbot+e417648b303855b91d8a@syzkaller.appspotmail.com
Fixes: 7d5cb45655f2 ("i2c compat ioctls: move to ->compat_ioctl()")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-dev.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index bce0e8bb7852..cf5d049342ea 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -535,6 +535,9 @@ static long compat_i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned lo sizeof(rdwr_arg))) return -EFAULT; + if (!rdwr_arg.msgs || rdwr_arg.nmsgs == 0) + return -EINVAL; + if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS) return -EINVAL; |