diff options
| author | Lee Jones <lee.jones@linaro.org> | 2022-07-08 10:40:09 +0300 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2022-08-25 11:22:15 +0300 |
| commit | cd11d1a6114bd4bc6450ae59f6e110ec47362126 (patch) | |
| tree | 2e8cd6a339dea5ae44c8930b78731e801d5203bd /drivers/hid/hid-steam.c | |
| parent | 8d9420ca9bd9bceddcfab3d0263d6a8e073396fe (diff) | |
| download | linux-cd11d1a6114bd4bc6450ae59f6e110ec47362126.tar.xz | |
HID: steam: Prevent NULL pointer dereference in steam_{recv,send}_report
It is possible for a malicious device to forgo submitting a Feature
Report. The HID Steam driver presently makes no prevision for this
and de-references the 'struct hid_report' pointer obtained from the
HID devices without first checking its validity. Let's change that.
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: linux-input@vger.kernel.org
Fixes: c164d6abf3841 ("HID: add driver for Valve Steam Controller")
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-steam.c')
| -rw-r--r-- | drivers/hid/hid-steam.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/hid/hid-steam.c b/drivers/hid/hid-steam.c index a3b151b29bd7..fc616db4231b 100644 --- a/drivers/hid/hid-steam.c +++ b/drivers/hid/hid-steam.c @@ -134,6 +134,11 @@ static int steam_recv_report(struct steam_device *steam, int ret; r = steam->hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[0]; + if (!r) { + hid_err(steam->hdev, "No HID_FEATURE_REPORT submitted - nothing to read\n"); + return -EINVAL; + } + if (hid_report_len(r) < 64) return -EINVAL; @@ -165,6 +170,11 @@ static int steam_send_report(struct steam_device *steam, int ret; r = steam->hdev->report_enum[HID_FEATURE_REPORT].report_id_hash[0]; + if (!r) { + hid_err(steam->hdev, "No HID_FEATURE_REPORT submitted - nothing to read\n"); + return -EINVAL; + } + if (hid_report_len(r) < 64) return -EINVAL; |