5.4-stable review patch. If anyone has any objections, please let me know.
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From: Gustavo A. R. Silva gustavoars@kernel.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@linux.intel.com Closes: https://lore.kernel.org/linux-hardening/ZsZNgfnEwOcPdCly@black.fi.intel.com/ Signed-off-by: Gustavo A. R. Silva gustavoars@kernel.org Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Acked-by: Brian Norris briannorris@chromium.org Signed-off-by: Kalle Valo kvalo@kernel.org Link: https://patch.msgid.link/ZsZa5xRcsLq9D+RX@elsanto Signed-off-by: Sasha Levin sashal@kernel.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 3e3134bcc2b06..bfa482cf464ff 100644 --- a/drivers/net/wireless/marvell/mwifiex/fw.h +++ b/drivers/net/wireless/marvell/mwifiex/fw.h @@ -1590,7 +1590,7 @@ 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 1ab04adc53dcd..5e7fc7ba3eda1 100644 --- a/drivers/net/wireless/marvell/mwifiex/scan.c +++ b/drivers/net/wireless/marvell/mwifiex/scan.c @@ -2563,8 +2563,7 @@ 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);