diff options
| author | Alexandru Hossu <hossu.alexandru@gmail.com> | 2026-05-22 02:45:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-07-07 13:43:22 +0200 |
| commit | f9654207e92283e0acac5d64fe5f8835383b5a23 (patch) | |
| tree | 9f0f8ae90d646446bb0e289c80b0d083bf9fd0c9 /drivers | |
| parent | f8001e1a516ba3b495728c65b61f799cbfad6bd0 (diff) | |
staging: rtl8723bs: fix OOB read in OnAssocRsp() IE loop
The IE parsing loop in OnAssocRsp() advances by (pIE->length + 2) each
iteration but only guards on i < pkt_len. When a malicious AP sends an
AssocResponse whose last IE has only one byte remaining in the frame
(the element_id byte lands at pkt_len-1), the loop reads pIE->length
from pframe[pkt_len], which is one byte past the allocated receive buffer.
Additionally, even when the header bytes are in bounds, pIE->length
itself can extend the data window beyond pkt_len, silently passing a
truncated IE to the handler functions.
Add two guards at the top of the loop body:
1. Break if fewer than sizeof(*pIE) bytes remain (can't read header).
2. Break if the IE's declared data extends past pkt_len.
Fixes: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver")
Cc: stable <stable@kernel.org>
Signed-off-by: Alexandru Hossu <hossu.alexandru@gmail.com>
Reviewed-by: Luka Gejak <luka.gejak@linux.dev>
Link: https://patch.msgid.link/20260522004531.1038924-6-hossu.alexandru@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/rtl8723bs/core/rtw_mlme_ext.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c index 70e864cd530d..a443b3530fb9 100644 --- a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c +++ b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c @@ -1371,7 +1371,11 @@ unsigned int OnAssocRsp(struct adapter *padapter, union recv_frame *precv_frame) /* to handle HT, WMM, rate adaptive, update MAC reg */ /* for not to handle the synchronous IO in the tasklet */ for (i = (6 + WLAN_HDR_A3_LEN); i < pkt_len;) { + if (i + sizeof(*pIE) > pkt_len) + break; pIE = (struct ndis_80211_var_ie *)(pframe + i); + if (i + sizeof(*pIE) + pIE->length > pkt_len) + break; switch (pIE->element_id) { case WLAN_EID_VENDOR_SPECIFIC: |