Bluetooth: MGMT: Fix OOB access in parse_adv_monitor_pattern()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: Fix OOB access in parse_adv_monitor_pattern() In the parse_adv_monitor_pattern() function, the value of the 'length' variable is currently limited to HCI_MAX_EXT_AD_LENGTH(251). The size of the 'value' array in the mgmt_adv_pattern structure is 31. If the value of 'pattern[i].length' is set in the user space and exceeds 31, the 'patterns[i].value' array can be accessed out of bound when copied. Increasing the size of the 'value' array in the 'mgmt_adv_pattern' structure will break the userspace. Considering this, and to avoid OOB access revert the limits for 'offset' and 'length' back to the value of HCI_MAX_AD_LENGTH. Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE.

References

• https://git.kernel.org/stable/c/96616530f524a0a76248cd44201de0a9e8526190
• https://git.kernel.org/stable/c/5f7350ff2b179764a4f40ba4161b60b8aaef857b
• https://git.kernel.org/stable/c/4b7d4aa5399b5a64caee639275615c63c008540d
• https://git.kernel.org/stable/c/3a50d59b3781bc3a4e96533612509546a4c309a7
• https://git.kernel.org/stable/c/8d59fba49362c65332395789fd82771f1028d87e