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 --- fs/9p/cache.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 fs/9p/cache.c (limited to 'fs/9p/cache.c') diff --git a/fs/9p/cache.c b/fs/9p/cache.c new file mode 100644 index 000000000..12c0ae29f --- /dev/null +++ b/fs/9p/cache.c @@ -0,0 +1,76 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * V9FS cache definitions. + * + * Copyright (C) 2009 by Abhishek Kulkarni + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "v9fs.h" +#include "cache.h" + +int v9fs_cache_session_get_cookie(struct v9fs_session_info *v9ses, + const char *dev_name) +{ + struct fscache_volume *vcookie; + char *name, *p; + + name = kasprintf(GFP_KERNEL, "9p,%s,%s", + dev_name, v9ses->cachetag ?: v9ses->aname); + if (!name) + return -ENOMEM; + + for (p = name; *p; p++) + if (*p == '/') + *p = ';'; + + vcookie = fscache_acquire_volume(name, NULL, NULL, 0); + p9_debug(P9_DEBUG_FSC, "session %p get volume %p (%s)\n", + v9ses, vcookie, name); + if (IS_ERR(vcookie)) { + if (vcookie != ERR_PTR(-EBUSY)) { + kfree(name); + return PTR_ERR(vcookie); + } + pr_err("Cache volume key already in use (%s)\n", name); + vcookie = NULL; + } + v9ses->fscache = vcookie; + kfree(name); + return 0; +} + +void v9fs_cache_inode_get_cookie(struct inode *inode) +{ + struct v9fs_inode *v9inode = V9FS_I(inode); + struct v9fs_session_info *v9ses; + __le32 version; + __le64 path; + + if (!S_ISREG(inode->i_mode)) + return; + if (WARN_ON(v9fs_inode_cookie(v9inode))) + return; + + version = cpu_to_le32(v9inode->qid.version); + path = cpu_to_le64(v9inode->qid.path); + v9ses = v9fs_inode2v9ses(inode); + v9inode->netfs.cache = + fscache_acquire_cookie(v9fs_session_cache(v9ses), + 0, + &path, sizeof(path), + &version, sizeof(version), + i_size_read(&v9inode->netfs.inode)); + if (v9inode->netfs.cache) + mapping_set_release_always(inode->i_mapping); + + p9_debug(P9_DEBUG_FSC, "inode %p get cookie %p\n", + inode, v9fs_inode_cookie(v9inode)); +} -- cgit v1.3.1