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wifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer

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In rtw_pci_rx_napi(), new_len is computed as the sum of pkt_len (14-bit
descriptor field, max 16383) and pkt_offset (drv_info_sz + shift, both
firmware-controlled). The result can exceed RTK_PCI_RX_BUF_SIZE (11478),
causing an out-of-bounds read from the pre-allocated DMA buffer when
skb_put_data copies new_len bytes. The USB transport already validates
this (rtw_usb_rx_data_put checks against RTW_USB_MAX_RECVBUF_SZ); the
PCIe path does not.

Add a check that new_len does not exceed the DMA buffer size.

Fixes: e3037485c6 ("rtw88: new Realtek 802.11ac driver")
Signed-off-by: Tristan Madani <tristan@talencesecurity.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260421111434.3389674-1-tristmd@gmail.com
This commit is contained in:
Tristan Madani 2026-04-21 11:14:34 +00:00 committed by Ping-Ke Shih
parent b465bc7e18
commit 6e76e9ed27
1 changed files with 5 additions and 0 deletions
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5
drivers/net/wireless/realtek/rtw88/pci.c
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@ -1077,6 +1077,11 @@ static u32 rtw_pci_rx_napi(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci,
* discard the frame if none available
*/
new_len = pkt_stat.pkt_len + pkt_offset;
if (unlikely(new_len > RTK_PCI_RX_BUF_SIZE)) {
rtw_dbg(rtwdev, RTW_DBG_RX,
"oversized RX packet: %u\n", new_len);
goto next_rp;
}
new = dev_alloc_skb(new_len);
if (WARN_ONCE(!new, "rx routine starvation\n"))
goto next_rp;