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Change History

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

mtd: nand: ecc-mxic: Fix use of uninitialized variable ret

If ctx->steps is zero, the loop processing ECC steps is skipped,
and the variable ret remains uninitialized. It is later checked
and returned, which leads to undefined behavior and may cause
unpredictable results in user space or kernel crashes.

This scenario can be triggered in edge cases such as misconfigured
geometry, ECC engine misuse, or if ctx->steps is not validated
after initialization.

Initialize ret to zero before the loop to ensure correct and safe
behavior regardless of the ctx->steps value.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

https://git.kernel.org/stable/c/49482f4a39620f6afedcd3f6aa9e0d558b6a460b

https://git.kernel.org/stable/c/4d9d6e4be09472aa72953caca3dbefdc27846170

https://git.kernel.org/stable/c/7a23cc510ecaabab4f6df7e9d910d16e279b72ad

https://git.kernel.org/stable/c/a0d9d9b5a4634e146ae41cb25667322e5c7d74d2

https://git.kernel.org/stable/c/d95846350aac72303036a70c4cdc69ae314aa26d