CVE-2022-50765

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> RISC-V: kexec: Fix memory leak of elf header buffer<br /> <br /> This is reported by kmemleak detector:<br /> <br /> unreferenced object 0xff2000000403d000 (size 4096):<br /> comm "kexec", pid 146, jiffies 4294900633 (age 64.792s)<br /> hex dump (first 32 bytes):<br /> 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 .ELF............<br /> 04 00 f3 00 01 00 00 00 00 00 00 00 00 00 00 00 ................<br /> backtrace:<br /> [] kmemleak_vmalloc+0x3c/0xbe<br /> [] __vmalloc_node_range+0x3ac/0x560<br /> [] __vmalloc_node+0x56/0x62<br /> [] vzalloc+0x2c/0x34<br /> [] crash_prepare_elf64_headers+0x80/0x30c<br /> [] elf_kexec_load+0x3e8/0x4ec<br /> [] kexec_image_load_default+0x40/0x4c<br /> [] sys_kexec_file_load+0x1c4/0x322<br /> [] ret_from_syscall+0x0/0x2<br /> <br /> In elf_kexec_load(), a buffer is allocated via vzalloc() to store elf<br /> headers. While it&amp;#39;s not freed back to system when kdump kernel is<br /> reloaded or unloaded, or when image-&gt;elf_header is successfully set and<br /> then fails to load kdump kernel for some reason. Fix it by freeing the<br /> buffer in arch_kimage_file_post_load_cleanup().