ext4: fix memory leaks in ext4_fname_{setup_filename,prepare_lookup}

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix memory leaks in ext4_fname_{setup_filename,prepare_lookup} If the filename casefolding fails, we'll be leaking memory from the fscrypt_name struct, namely from the 'crypto_buf.name' member. Make sure we free it in the error path on both ext4_fname_setup_filename() and ext4_fname_prepare_lookup() functions.

References

• https://git.kernel.org/stable/c/98fc9c2cc45cfcb56961a73de3ec69b474063fc0
• https://git.kernel.org/stable/c/1fb3f1bbfdb511034b0360dbeb0f6a8424ed2a5c
• https://git.kernel.org/stable/c/36daf050be3f6f067631dc52054de2d3b7cc849f
• https://git.kernel.org/stable/c/7ca4b085f430f3774c3838b3da569ceccd6a0177