Re: [PATCH v3 1/3] tracing/probes: Fix anon_stack check for unnamed bitfields in btf_find_struct_member

[sashiko-bot@kernel.org]

> From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
> 
> btf_find_struct_member() traverses into nested anonymous structures
> and unions by pushing members with !member->name_off onto anon_stack.
> However, it does not consider the unnamed bitfields (e.g. `int : 5`
> or `unsigned int : 0`) which also have member->name_off == 0.
> 
> If such an unnamed bitfield is pushed to anon_stack, the
> btf_find_struct_member() return an error even if there are other
> valid entries in anon_stack.
> 
> To fix this, only push unnamed struct/union members to anon_stack.
> Also move the btf_type_is_struct() check to the entry of this function
> because now it is sure only struct/union are pushed to anon_stack.
> 
> Fixes: 302db0f5b3d8 ("tracing/probes: Add a function to search a member of a struct/union")
> Cc: stable@vger.kernel.org
> Reported-by: Sashiko <sashiko-bot@kernel.org>
> Closes: https://lore.kernel.org/all/20260830143859.D56991F00A3D@smtp.kernel.org/
> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/178827248631.123716.2627172171811720261.stgit@devnote2?part=1