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 --- lib/zlib_dfltcc/dfltcc.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 lib/zlib_dfltcc/dfltcc.c (limited to 'lib/zlib_dfltcc/dfltcc.c') diff --git a/lib/zlib_dfltcc/dfltcc.c b/lib/zlib_dfltcc/dfltcc.c new file mode 100644 index 000000000..ac6ac9739 --- /dev/null +++ b/lib/zlib_dfltcc/dfltcc.c @@ -0,0 +1,40 @@ +// SPDX-License-Identifier: Zlib +/* dfltcc.c - SystemZ DEFLATE CONVERSION CALL support. */ + +#include +#include +#include "dfltcc_util.h" +#include "dfltcc.h" + +char *oesc_msg( + char *buf, + int oesc +) +{ + if (oesc == 0x00) + return NULL; /* Successful completion */ + else { +#ifdef STATIC + return NULL; /* Ignore for pre-boot decompressor */ +#else + sprintf(buf, "Operation-Ending-Supplemental Code is 0x%.2X", oesc); + return buf; +#endif + } +} + +void dfltcc_reset_state(struct dfltcc_state *dfltcc_state) { + /* Initialize available functions */ + if (is_dfltcc_enabled()) { + dfltcc(DFLTCC_QAF, &dfltcc_state->param, NULL, NULL, NULL, NULL, NULL); + memmove(&dfltcc_state->af, &dfltcc_state->param, sizeof(dfltcc_state->af)); + } else + memset(&dfltcc_state->af, 0, sizeof(dfltcc_state->af)); + + /* Initialize parameter block */ + memset(&dfltcc_state->param, 0, sizeof(dfltcc_state->param)); + dfltcc_state->param.nt = 1; + dfltcc_state->param.ribm = DFLTCC_RIBM; +} + +MODULE_LICENSE("GPL"); -- cgit v1.3.1