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Change History

In the Linux kernel, the following vulnerability has been resolved:

hwmon: (powerz) Fix missing usb_kill_urb() on signal interrupt

wait_for_completion_interruptible_timeout() returns -ERESTARTSYS when
interrupted. This needs to abort the URB and return an error. No data
has been received from the device so any reads from the transfer
buffer are invalid.

The original code tests !ret, which only catches the timeout case (0).
On signal delivery (-ERESTARTSYS), !ret is false so the function skips
usb_kill_urb() and falls through to read from the unfilled transfer
buffer.

Fix by capturing the return value into a long (matching the function
return type) and handling signal (negative) and timeout (zero) cases
with separate checks that both call usb_kill_urb() before returning.

https://git.kernel.org/stable/c/8b51277eec433d4e724b273a5a5c64e8acfbe405

https://git.kernel.org/stable/c/b66437cb20a2d9ef201f40b675569f8ea7787c9f

https://git.kernel.org/stable/c/b6cb07f02253bdefd2339e57eaa1428a7b28cd0f

https://git.kernel.org/stable/c/d64458784036f5818e22781254b6be299d52a19c