On Fri, Aug 30, 2019 at 05:46:49PM -0400, Hui Peng wrote:
The `uac_mixer_unit_descriptor` shown as below is read from the device side. In `parse_audio_mixer_unit`, `baSourceID` field is accessed from index 0 to `bNrInPins` - 1, the current implementation assumes that descriptor is always valid (the length of descriptor is no shorter than 5 + `bNrInPins`). If a descriptor read from the device side is invalid, it may trigger out-of-bound memory access.
struct uac_mixer_unit_descriptor { __u8 bLength; __u8 bDescriptorType; __u8 bDescriptorSubtype; __u8 bUnitID; __u8 bNrInPins; __u8 baSourceID[]; }This patch fixes the bug by add a sanity check on the length of the descriptor.
CVE: CVE-2018-15117
FWIW, the correct CVE id should be probably CVE-2019-15117 here.
But there was already a patch queued and released in 5.2.10 and 4.19.68 for this issue (as far I can see; is this correct?)
Regards, Salvatore