CVE-2023-54062

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

ext4: fix invalid free tracking in ext4_xattr_move_to_block()

In ext4_xattr_move_to_block(), the value of the extended attribute

which we need to move to an external block may be allocated by

kvmalloc() if the value is stored in an external inode. So at the end

of the function the code tried to check if this was the case by

testing entry->e_value_inum.

However, at this point, the pointer to the xattr entry is no longer

valid, because it was removed from the original location where it had

been stored. So we could end up calling kvfree() on a pointer which

was not allocated by kvmalloc(); or we could also potentially leak

memory by not freeing the buffer when it should be freed. Fix this by

storing whether it should be freed in a separate variable.