From ff917923f4fb9c83717ba135ee47d7e4c1567bb7 Mon Sep 17 00:00:00 2001 From: Muhammad Bilal Date: Tue, 28 Jul 2026 17:54:55 +0500 Subject: staging: rtl8723bs: fix OOB read in rtw_action_frame_parse() rtw_action_frame_parse() takes a frame_len parameter but never actually checks it before indexing into the frame body: const u8 *frame_body = frame + sizeof(struct ieee80211_hdr_3addr); ... c = frame_body[0]; ... a = frame_body[1]; frame_body already points 24 bytes (sizeof(struct ieee80211_hdr_3addr)) into frame, so reading frame_body[0] and frame_body[1] requires frame_len >= 26. A management action frame shorter than that (e.g. exactly 24 bytes, the minimum a malicious peer can send) causes a 1-2 byte out-of-bounds read. This is reachable from rtw_cfg80211_monitor_if_xmit_entry() and cfg80211_rtw_mgmt_tx() in ioctl_cfg80211.c, both of which pass attacker/user-influenced frame buffers and lengths straight through. Add the missing length check before frame_body is dereferenced. Fixes: 554c0a3abf216 ("staging: Add rtl8723bs sdio wifi driver") Cc: stable@vger.kernel.org Signed-off-by: Muhammad Bilal Link: https://patch.msgid.link/20260728125456.32359-3-meatuni001@gmail.com Signed-off-by: Greg Kroah-Hartman --- include/crypto/cast6.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 include/crypto/cast6.h (limited to 'include/crypto/cast6.h') diff --git a/include/crypto/cast6.h b/include/crypto/cast6.h new file mode 100644 index 000000000..38f490cd5 --- /dev/null +++ b/include/crypto/cast6.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _CRYPTO_CAST6_H +#define _CRYPTO_CAST6_H + +#include +#include +#include + +#define CAST6_BLOCK_SIZE 16 +#define CAST6_MIN_KEY_SIZE 16 +#define CAST6_MAX_KEY_SIZE 32 + +struct cast6_ctx { + u32 Km[12][4]; + u8 Kr[12][4]; +}; + +int __cast6_setkey(struct cast6_ctx *ctx, const u8 *key, unsigned int keylen); +int cast6_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen); + +void __cast6_encrypt(const void *ctx, u8 *dst, const u8 *src); +void __cast6_decrypt(const void *ctx, u8 *dst, const u8 *src); + +#endif -- cgit v1.3.1