[PATCH] wifi: ieee80211: annotate struct s1g_tim_enc_block with __counted_by_ptr

[Bill Wendling <morbo@google.com>]

The GCC and Clang compilers support the "__counted_by_ptr" attribute on
pointer fields to associate them with an element count in the same
struct. This enables KASAN and UBSan bounds checking to detect
out-of-bounds accesses to the pointer.

In "include/linux/ieee80211-s1g.h", "struct s1g_tim_enc_block" has a
pointer member "ptr" of type "const u8 *" whose size is described by the
"len" member, which is correctly populated with the size of the buffer
before any pointer dereferences.

Cc: codemender-patching+linux@google.com
Assisted-by: LLM
Signed-off-by: Bill Wendling <morbo@google.com>
---
 include/linux/ieee80211-s1g.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/ieee80211-s1g.h b/include/linux/ieee80211-s1g.h
index 3f9626ad3d97..8f6107782c38 100644
--- a/include/linux/ieee80211-s1g.h
+++ b/include/linux/ieee80211-s1g.h
@@ -349,7 +349,7 @@ struct s1g_tim_aid {
 struct s1g_tim_enc_block {
 	u8 enc_mode;
 	bool inverse;
-	const u8 *ptr;
+	const u8 *ptr __counted_by_ptr(len);
 	u8 len;
 
 	/*
-- 
2.55.0.1082.g2b9226bbc0-goog