[PATCH] kho: fix error handling in kho_add_subtree()

[Mike Rapoport]

On Tue, Apr 07, 2026 at 10:01:47AM -0700, Breno Leitao wrote:
> Fix two error handling issues in kho_add_subtree(), where it doesn't
> handle the error path correctly.
> 
> 1. If fdt_setprop() fails after the subnode has been created, the
>    subnode is not removed. This leaves an incomplete node in the FDT
>    (missing "preserved-data" or "blob-size" properties).
> 
> 2. The fdt_setprop() return value (an FDT error code) is stored
>    directly in err and returned to the caller, which expects -errno.
> 
> Fix both by storing fdt_setprop() results in fdt_err, jumping to a new
> out_del_node label that removes the subnode on failure, and only setting
> err = 0 on the success path, otherwise returning -ENOMEM (instead of
> FDT_ERR_ errors that would come from fdt_setprop).
> 
> Fixes: 3dc92c311498 ("kexec: add Kexec HandOver (KHO) generation helpers")
> Suggested-by: Pratyush Yadav <pratyush at kernel.org>
> Signed-off-by: Breno Leitao <leitao at debian.org>

Reviewed-by: Mike Rapoport (Microsoft) <rppt at kernel.org>

> ---
>  kernel/liveupdate/kexec_handover.c | 21 +++++++++++++--------
>  1 file changed, 13 insertions(+), 8 deletions(-)

-- 
Sincerely yours,
Mike.