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1c25bfad93
mwifiex_process_mgmt_packet() accepts an rx_pkt_length as small as a
four-address struct ieee80211_hdr plus the two-byte firmware length prefix.
After stripping the prefix, mwifiex_parse_mgmt_packet() can receive a
frame equal to sizeof(struct ieee80211_hdr).
For action frames, the parser reads the category byte immediately after
that header and, for a public action frame, reads the following action
code byte without verifying that either field is present. A truncated frame
can therefore make the parser consume up to two bytes past the
firmware-declared frame length. If those bytes look like a TDLS discovery
response, the malformed frame can spuriously update peer signal state.
Require the category and public action-code fields before reading them.
Use sizeof(*ieee_hdr) so the checks and field accesses directly match the
firmware four-address layout being parsed before address4 is removed.
Suggested-by: Johannes Berg <johannes@sipsolutions.net>
Suggested-by: Brian Norris <briannorris@chromium.org>
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| README | ||
Linux kernel ============ The Linux kernel is the core of any Linux operating system. It manages hardware, system resources, and provides the fundamental services for all other software. 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