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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2022-08-19 08:20:36 +0300 |
|---|---|---|
| committer | Tzung-Bi Shih <tzungbi@kernel.org> | 2022-08-22 06:56:45 +0000 |
| commit | 8a07b45fd3c2dda24fad43639be5335a4595196a (patch) | |
| tree | 316b17ad4b9ece0d4aa10d59bec0ce4ce94cb2be /drivers/platform/chrome | |
| parent | 6ad4194d6a1e1d11b285989cd648ef695b4a93c0 (diff) | |
| download | linux-8a07b45fd3c2dda24fad43639be5335a4595196a.tar.gz linux-8a07b45fd3c2dda24fad43639be5335a4595196a.tar.bz2 linux-8a07b45fd3c2dda24fad43639be5335a4595196a.zip | |
platform/chrome: fix memory corruption in ioctl
If "s_mem.bytes" is larger than the buffer size it leads to memory
corruption.
Fixes: eda2e30c6684 ("mfd / platform: cros_ec: Miscellaneous character device to talk with the EC")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/Yv8dpCFZJdbUT5ye@kili
Diffstat (limited to 'drivers/platform/chrome')
| -rw-r--r-- | drivers/platform/chrome/cros_ec_chardev.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/platform/chrome/cros_ec_chardev.c b/drivers/platform/chrome/cros_ec_chardev.c index fd33de546aee..0de7c255254e 100644 --- a/drivers/platform/chrome/cros_ec_chardev.c +++ b/drivers/platform/chrome/cros_ec_chardev.c @@ -327,6 +327,9 @@ static long cros_ec_chardev_ioctl_readmem(struct cros_ec_dev *ec, if (copy_from_user(&s_mem, arg, sizeof(s_mem))) return -EFAULT; + if (s_mem.bytes > sizeof(s_mem.buffer)) + return -EINVAL; + num = ec_dev->cmd_readmem(ec_dev, s_mem.offset, s_mem.bytes, s_mem.buffer); if (num <= 0) |