[PATCH] [kexec]: arch/arm64/kernel/machine_kexec_file.c:152 load_other_segments() warn: missing error code 'ret'

[PATCH] [kexec]: arch/arm64/kernel/machine_kexec_file.c:152 load_other_segments() warn: missing error code 'ret'

[Lakshmi Ramasubramanian]

Return code is not set to an error code in load_other_segments() when
of_kexec_alloc_and_setup_fdt() call returns a NULL dtb. This results
in status success (return code set to 0) being returned from
load_other_segments().

Set return code to -ENOMEM if of_kexec_alloc_and_setup_fdt() returns
NULL dtb.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
---
Patch created in dt/next branch in git repo
https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git

 arch/arm64/kernel/machine_kexec_file.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 63634b4d72c1..04d072885e64 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -149,6 +149,7 @@ int load_other_segments(struct kimage *image,
 					   initrd_len, cmdline, 0);
 	if (!dtb) {
 		pr_err("Preparing for new dtb failed\n");
+		ret = -ENOMEM;
 		goto out_err;
 	}
 
-- 
2.25.1

Re: [PATCH] [kexec]: arch/arm64/kernel/machine_kexec_file.c:152 load_other_segments() warn: missing error code 'ret'

[Rob Herring]

On Wed, Dec 8, 2021 at 11:09 AM Lakshmi Ramasubramanian
<nramas@linux.microsoft.com> wrote:
>

Please use get_maintainers.pl so the right people are Cc'ed. In this
case being in arch/arm64, it needs to go to Will and Catalin and
lakml. They will need to apply this.

The subject and commit message needs some work. Something like:

arm64: kexec: Fix smatch 'ret' warning in load_other_segments()

Since commit ac10be5cdbfa ("arm64: Use common
of_kexec_alloc_and_setup_fdt()"), smatch has a warning:

arch/arm64/kernel/machine_kexec_file.c:152 load_other_segments() warn:
missing error code 'ret'

...and then the rest:

> Return code is not set to an error code in load_other_segments() when
> of_kexec_alloc_and_setup_fdt() call returns a NULL dtb. This results
> in status success (return code set to 0) being returned from
> load_other_segments().
>
> Set return code to -ENOMEM if of_kexec_alloc_and_setup_fdt() returns
> NULL dtb.
>
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

Fixes: ac10be5cdbfa ("arm64: Use common of_kexec_alloc_and_setup_fdt()")

> ---
> Patch created in dt/next branch in git repo
> https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git
>
>  arch/arm64/kernel/machine_kexec_file.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
> index 63634b4d72c1..04d072885e64 100644
> --- a/arch/arm64/kernel/machine_kexec_file.c
> +++ b/arch/arm64/kernel/machine_kexec_file.c
> @@ -149,6 +149,7 @@ int load_other_segments(struct kimage *image,
>                                            initrd_len, cmdline, 0);
>         if (!dtb) {
>                 pr_err("Preparing for new dtb failed\n");
> +               ret = -ENOMEM;
>                 goto out_err;
>         }
>
> --
> 2.25.1
>