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platform/chrome: cros_ec_chardev: fix kernel data leak from ioctl

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[ Upstream commit b20cf3f89c ]

It is possible to peep kernel page's data by providing larger `insize`
in struct cros_ec_command[1] when invoking EC host commands.

Fix it by using zeroed memory.

[1]: https://elixir.bootlin.com/linux/v6.2/source/include/linux/platform_data/cros_ec_proto.h#L74

Fixes: eda2e30c66 ("mfd / platform: cros_ec: Miscellaneous character device to talk with the EC")
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Link: https://lore.kernel.org/r/20230324010658.1082361-1-tzungbi@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tzung-Bi Shih 2023-03-24 09:06:58 +08:00 committed by Greg Kroah-Hartman
parent a18fb433ce
commit 13493ad6a2
1 changed files with 1 additions and 1 deletions
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2
drivers/platform/chrome/cros_ec_chardev.c
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@ -285,7 +285,7 @@ static long cros_ec_chardev_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg)
u_cmd.insize > EC_MAX_MSG_BYTES)
return -EINVAL;
s_cmd = kmalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize),
s_cmd = kzalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize),
GFP_KERNEL);
if (!s_cmd)
return -ENOMEM;