powerpc: If kexec_build_elf_info() fails return immediately from elf64_load()

mainline inclusion
from mainline-v5.13-rc1
commit 031cc263
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I53YJF

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=031cc263c037a95e5d1249cbd3d55b77021f1eb8

--------------------------------

Uninitialized local variable "elf_info" would be passed to
kexec_free_elf_info() if kexec_build_elf_info() returns an error
in elf64_load().

If kexec_build_elf_info() returns an error, return the error
immediately.
Signed-off-by: NLakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NMichael Ellerman <mpe@ellerman.id.au>
Signed-off-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210421163610.23775-2-nramas@linux.microsoft.comSigned-off-by: NLin Yujun <linyujun809@huawei.com>
Reviewed-by: NZhang Jianhua <chris.zjh@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/powerpc/kexec/elf_64.c

@@ -45,7 +45,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 
 	ret = kexec_build_elf_info(kernel_buf, kernel_len, &ehdr, &elf_info);
 	if (ret)
-		goto out;
+		return ERR_PTR(ret);
 
 	if (image->type == KEXEC_TYPE_CRASH) {
 		/* min & max buffer values for kdump case */