function dualshock4_get_calibration_data allocates memory to pointer buf. however the function may exit prematurely due to transfer_failure in this case it does not handle freeing memory.
this patch handles memory deallocation at exit.
Reported-by: syzbot+4f5f81e1456a1f645bf8@syzkaller.appspotmail.com Tested-by: syzbot+4f5f81e1456a1f645bf8@syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/691560c4.a70a0220.3124cb.0019.GAE@google.com/T/ Fixes: 947992c7fa9e0 ("HID: playstation: DS4: Fix calibration workaround for clone devices") Cc: stable@vger.kernel.org Signed-off-by: Eslam Khafagy eslam.medhat1993@gmail.com --- v2: * Adding tag "Cc: stable@vger.kernel.org" v1: https://lore.kernel.org/all/20251115022323.1395726-1-eslam.medhat1993@gmail.... --- drivers/hid/hid-playstation.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/hid/hid-playstation.c b/drivers/hid/hid-playstation.c index 63f6eb9030d1..fef81b7e27c1 100644 --- a/drivers/hid/hid-playstation.c +++ b/drivers/hid/hid-playstation.c @@ -1992,9 +1992,6 @@ static int dualshock4_get_calibration_data(struct dualshock4 *ds4) acc_z_plus = get_unaligned_le16(&buf[31]); acc_z_minus = get_unaligned_le16(&buf[33]);
- /* Done parsing the buffer, so let's free it. */ - kfree(buf); - /* * Set gyroscope calibration and normalization parameters. * Data values will be normalized to 1/DS4_GYRO_RES_PER_DEG_S degree/s. @@ -2041,6 +2038,10 @@ static int dualshock4_get_calibration_data(struct dualshock4 *ds4) ds4->accel_calib_data[2].sens_denom = range_2g;
transfer_failed: + /* First free buf if still allocated */ + if(buf) + kfree(buf); + /* * Sanity check gyro calibration data. This is needed to prevent crashes * during report handling of virtual, clone or broken devices not implementing