From: Ping-Ke Shih pkshih@realtek.com
[ Upstream commit 2b8bdc5237014cc61784b3676cbaca5325959f3d ]
To access firmware elements appended after multi-firmware, add its size as offset to get start address of firmware elements.
+-----+-------+------+---------+--------------+ -- | sig | fw_nr | rsvd | version | reserved | \ +---------------------------------------------+ | fw 0 | cv | type | mp | rsvd | shift | size | rsvd | | +---------------------------------------------+ | fw 1 | cv | type | mp | rsvd | shift | size | rsvd | | +---------------------------------------------+ | fw N-1 | ... | | +=============================================+ | mfw size | fw 0 content | | +=============================================+ | | fw 1 content | | +=============================================+ | | ... | | +=============================================+ | | fw N -1 content | | +=============================================+ --/ | fw element TLV X | +=============================================+ | fw element TLV Y | +=============================================+ | fw element TLV Z | +=============================================+
To avoid Coverity warning when getting mfw size, validate it header ahead.
Addresses-Coverity-ID: 1544385 ("Untrusted array index read")
Signed-off-by: Ping-Ke Shih pkshih@realtek.com Link: https://patch.msgid.link/20250203072911.47313-5-pkshih@realtek.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/realtek/rtw89/fw.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/net/wireless/realtek/rtw89/fw.c b/drivers/net/wireless/realtek/rtw89/fw.c index f4b3438615541..aed0647955d8e 100644 --- a/drivers/net/wireless/realtek/rtw89/fw.c +++ b/drivers/net/wireless/realtek/rtw89/fw.c @@ -601,12 +601,17 @@ static u32 rtw89_mfw_get_size(struct rtw89_dev *rtwdev) (const struct rtw89_mfw_hdr *)firmware->data; const struct rtw89_mfw_info *mfw_info; u32 size; + int ret;
if (mfw_hdr->sig != RTW89_MFW_SIG) { rtw89_warn(rtwdev, "not mfw format\n"); return 0; }
+ ret = rtw89_mfw_validate_hdr(rtwdev, firmware, mfw_hdr); + if (ret) + return ret; + mfw_info = &mfw_hdr->info[mfw_hdr->fw_nr - 1]; size = le32_to_cpu(mfw_info->shift) + le32_to_cpu(mfw_info->size);