staging: rtl8723bs: fix OOB read in rtw_action_frame_parse()grafted

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 <meatuni001@gmail.com>
Link: https://patch.msgid.link/20260728125456.32359-3-meatuni001@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/drivers/crypto/starfive/Kconfig b/drivers/crypto/starfive/Kconfig
new file mode 100644
index 000000000..11518ca3e
--- /dev/null
+++ b/drivers/crypto/starfive/Kconfig
@@ -0,0 +1,26 @@
+#
+# StarFive crypto drivers configuration
+#
+
+config CRYPTO_DEV_JH7110
+	tristate "StarFive JH7110 cryptographic engine driver"
+	depends on (SOC_STARFIVE && AMBA_PL08X) || COMPILE_TEST
+	depends on HAS_DMA
+	select CRYPTO_ENGINE
+	select CRYPTO_HMAC
+	select CRYPTO_SHA256
+	select CRYPTO_SHA512
+	select CRYPTO_SM3
+	select CRYPTO_RSA
+	select CRYPTO_AES
+	select CRYPTO_CCM
+	select CRYPTO_GCM
+	select CRYPTO_ECB
+	select CRYPTO_CBC
+	select CRYPTO_CTR
+	help
+	  Support for StarFive JH7110 crypto hardware acceleration engine.
+	  This module provides acceleration for public key algo,
+	  skciphers, AEAD and hash functions.
+
+	  If you choose 'M' here, this module will be called jh7110-crypto.