CVE-2022-49163

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

media: imx-jpeg: fix a bug of accessing array out of bounds

When error occurs in parsing jpeg, the slot isnt acquired yet, it may be the default value MXC_MAX_SLOTS. If the driver access the slot using the incorrect slot number, it will access array out of bounds. The result is the driver will change num_domains, which follows slot_data in struct mxc_jpeg_dev. Then the driver wont detach the pm domain at rmmod, which will lead to kernel panic when trying to insmod again.

Weakness

The product reads data past the end, or before the beginning, of the intended buffer.

Affected Software

Potential Mitigations

• Assume all input is malicious. Use an “accept known good” input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
• When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, “boat” may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as “red” or “blue.”
• Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code’s environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
• To reduce the likelihood of introducing an out-of-bounds read, ensure that you validate and ensure correct calculations for any length argument, buffer size calculation, or offset. Be especially careful of relying on a sentinel (i.e. special character such as NUL) in untrusted inputs.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/540.html

References

• https://git.kernel.org/stable/c/02f9f97d54ffc85b50ad77f5b1f3c8f69cd17747
• https://git.kernel.org/stable/c/20c8b90430c5d6c4a3936eaa7c35aac670581487
• https://git.kernel.org/stable/c/97558d170a1236280407e8d29a7d095d2c2ed554
• https://git.kernel.org/stable/c/e209e6db2e527db6a93b14c2deedf969caca78fc