pcmcia: Add error handling for add_interval() in do_validate_mem()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: pcmcia: Add error handling for add_interval() in do_validate_mem() In the do_validate_mem(), the call to add_interval() does not handle errors. If kmalloc() fails in add_interval(), it could result in a null pointer being inserted into the linked list, leading to illegal memory access when sub_interval() is called next. This patch adds an error handling for the add_interval(). If add_interval() returns an error, the function will return early with the error code.

References

• https://git.kernel.org/stable/c/5b60ed401b47897352c520bc724c85aa908dedcc
• https://git.kernel.org/stable/c/ae184024ef31423e5beb44cf4f52999bbcf2fe5b
• https://git.kernel.org/stable/c/85be7ef8c8e792a414940a38d94565dd48d2f236
• https://git.kernel.org/stable/c/06b26e3099207c94b3d1be8565aedc6edc4f0a60
• https://git.kernel.org/stable/c/8699358b6ac99b8ccc97ed9e6e3669ef8958ef7b
• https://git.kernel.org/stable/c/289b58f8ff3198d091074a751d6b8f6827726f3e
• https://git.kernel.org/stable/c/369bf6e241506583f4ee7593c53b92e5a9f271b4
• https://git.kernel.org/stable/c/4a81f78caa53e0633cf311ca1526377d9bff7479