Re: [PATCH v2] livepatch: Fix NULL pointer dereference in klp_find_func()

[Petr Mladek <pmladek@suse.com>]

On Sun 2026-06-28 19:46:35, Yafang Shao wrote:
> A NULL old_name in a newly loaded livepatch's function entry causes a
> NULL pointer dereference in strcmp():
> 
>   klp_init_patch()
>     klp_add_nops()
>       klp_find_func()
>         strcmp(old_func->old_name, func->old_name)
> 
> Add klp_check_patch() at the beginning of klp_enable_patch() to reject
> patches with NULL old_name before they reach this code path.
> 
> Reported-by: sashiko-bot <sashiko-bot@kernel.org>
> Closes: https://lore.kernel.org/live-patching/20260529040130.95A9C1F00893@smtp.kernel.org/
> Suggested-by: Petr Mladek <pmladek@suse.com>
> Suggested-by: Miroslav Benes <mbenes@suse.cz>
> Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
> Acked-by: Miroslav Benes <mbenes@suse.cz>

JFYI, the patch has been committed into livepatching.git,
branch for-7.3/trivial.

Best Regards,
Petr