crypto: iaa - Fix out-of-bounds index in find_empty_iaa_compression_mode

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: crypto: iaa - Fix out-of-bounds index in find_empty_iaa_compression_mode The local variable 'i' is initialized with -EINVAL, but the for loop immediately overwrites it and -EINVAL is never returned. If no empty compression mode can be found, the function would return the out-of-bounds index IAA_COMP_MODES_MAX, which would cause an invalid array access in add_iaa_compression_mode(). Fix both issues by returning either a valid index or -EINVAL.

References

• https://git.kernel.org/stable/c/c77b33b58512708bd5603f48465f018c8b748847
• https://git.kernel.org/stable/c/d75207465eed20bc9b0daa4a0927de9568996067
• https://git.kernel.org/stable/c/de16f5bca05cace238d237791ed1b6e9d22dab60
• https://git.kernel.org/stable/c/48329301969f6d21b2ef35f678e40f72b59eac94