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, 46 insertions, 0 deletions

diff --git a/arch/alpha/lib/Makefile b/arch/alpha/lib/Makefile
new file mode 100644
index 000000000..84046e730
--- /dev/null
+++ b/arch/alpha/lib/Makefile
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for alpha-specific library files..
+#
+
+asflags-y := $(KBUILD_CFLAGS)
+
+# Many of these routines have implementations tuned for ev6.
+# Choose them iff we're targeting ev6 specifically.
+ev6-$(CONFIG_ALPHA_EV6) := ev6-
+
+# Several make use of the cttz instruction introduced in ev67.
+ev67-$(CONFIG_ALPHA_EV67) := ev67-
+
+lib-y =	__divqu.o __remqu.o __divlu.o __remlu.o \
+	udiv-qrnnd.o \
+	udelay.o \
+	$(ev6-y)memset.o \
+	$(ev6-y)memcpy.o \
+	memmove.o \
+	checksum.o \
+	csum_partial_copy.o \
+	$(ev67-y)strlen.o \
+	stycpy.o \
+	styncpy.o \
+	$(ev67-y)strchr.o \
+	$(ev67-y)strrchr.o \
+	$(ev6-y)memchr.o \
+	$(ev6-y)copy_user.o \
+	$(ev6-y)clear_user.o \
+	$(ev6-y)csum_ipv6_magic.o \
+	$(ev6-y)clear_page.o \
+	$(ev6-y)copy_page.o \
+	fpreg.o \
+	callback_srm.o srm_puts.o srm_printk.o \
+	fls.o
+
+# The division routines are built from single source, with different defines.
+AFLAGS___divqu.o = -DDIV
+AFLAGS___remqu.o =       -DREM
+AFLAGS___divlu.o = -DDIV       -DINTSIZE
+AFLAGS___remlu.o =       -DREM -DINTSIZE
+
+$(addprefix $(obj)/,__divqu.o __remqu.o __divlu.o __remlu.o): \
+						$(src)/$(ev6-y)divide.S FORCE
+	$(call if_changed_rule,as_o_S)