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Message-ID: <20240925113641.1297102-85-sashal@kernel.org>
Date: Wed, 25 Sep 2024 07:25:06 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Brian Norris <briannorris@...omium.org>,
Kalle Valo <kvalo@...nel.org>,
Sasha Levin <sashal@...nel.org>,
francesco.dolcini@...adex.com,
kees@...nel.org,
yu-hao.lin@....com,
dmantipov@...dex.ru,
linux-wireless@...r.kernel.org
Subject: [PATCH AUTOSEL 6.11 085/244] wifi: mwifiex: Fix memcpy() field-spanning write warning in mwifiex_cmd_802_11_scan_ext()
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
[ Upstream commit 498365e52bebcbc36a93279fe7e9d6aec8479cee ]
Replace one-element array with a flexible-array member in
`struct host_cmd_ds_802_11_scan_ext`.
With this, fix the following warning:
elo 16 17:51:58 surfacebook kernel: ------------[ cut here ]------------
elo 16 17:51:58 surfacebook kernel: memcpy: detected field-spanning write (size 243) of single field "ext_scan->tlv_buffer" at drivers/net/wireless/marvell/mwifiex/scan.c:2239 (size 1)
elo 16 17:51:58 surfacebook kernel: WARNING: CPU: 0 PID: 498 at drivers/net/wireless/marvell/mwifiex/scan.c:2239 mwifiex_cmd_802_11_scan_ext+0x83/0x90 [mwifiex]
Reported-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Closes: https://lore.kernel.org/linux-hardening/ZsZNgfnEwOcPdCly@black.fi.intel.com/
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Acked-by: Brian Norris <briannorris@...omium.org>
Signed-off-by: Kalle Valo <kvalo@...nel.org>
Link: https://patch.msgid.link/ZsZa5xRcsLq9D+RX@elsanto
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/net/wireless/marvell/mwifiex/fw.h | 2 +-
drivers/net/wireless/marvell/mwifiex/scan.c | 3 +--
2 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/marvell/mwifiex/fw.h b/drivers/net/wireless/marvell/mwifiex/fw.h
index 3adc447b715f6..5b072120e3f21 100644
--- a/drivers/net/wireless/marvell/mwifiex/fw.h
+++ b/drivers/net/wireless/marvell/mwifiex/fw.h
@@ -1587,7 +1587,7 @@ struct host_cmd_ds_802_11_scan_rsp {
struct host_cmd_ds_802_11_scan_ext {
u32 reserved;
- u8 tlv_buffer[1];
+ u8 tlv_buffer[];
} __packed;
struct mwifiex_ie_types_bss_mode {
diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c
index 0326b121747cb..17ce84f5207e3 100644
--- a/drivers/net/wireless/marvell/mwifiex/scan.c
+++ b/drivers/net/wireless/marvell/mwifiex/scan.c
@@ -2530,8 +2530,7 @@ int mwifiex_ret_802_11_scan_ext(struct mwifiex_private *priv,
ext_scan_resp = &resp->params.ext_scan;
tlv = (void *)ext_scan_resp->tlv_buffer;
- buf_left = le16_to_cpu(resp->size) - (sizeof(*ext_scan_resp) + S_DS_GEN
- - 1);
+ buf_left = le16_to_cpu(resp->size) - (sizeof(*ext_scan_resp) + S_DS_GEN);
while (buf_left >= sizeof(struct mwifiex_ie_types_header)) {
type = le16_to_cpu(tlv->type);
--
2.43.0
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