On 2/6/24 12:39, Kees Cook wrote:
struct mwifiex_ie_types_chan_list_param_set::chan_scan_param is treated
as a flexible array, so convert it into one so that it doesn't trip the
array bounds sanitizer[1]. Only once place was using sizeof() on the
whole struct (in 11n.c), so adjust it to follow the calculation pattern
used by scan.c to avoid including the trailing single element.
Link: https://github.com/KSPP/linux/issues/51 [1]
Cc: Brian Norris <[email protected]>
Cc: Kalle Valo <[email protected]>
Cc: Dmitry Antipov <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: zuoqilin <[email protected]>
Cc: Ruan Jinjie <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Christophe JAILLET <[email protected]>
Cc: Gustavo A. R. Silva <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
---
drivers/net/wireless/marvell/mwifiex/11n.c | 8 +++-----
drivers/net/wireless/marvell/mwifiex/fw.h | 2 +-
drivers/net/wireless/marvell/mwifiex/scan.c | 14 ++++++--------
3 files changed, 10 insertions(+), 14 deletions(-)
diff --git a/drivers/net/wireless/marvell/mwifiex/11n.c
b/drivers/net/wireless/marvell/mwifiex/11n.c
index 90e401100898..9ed90da4dfcf 100644
--- a/drivers/net/wireless/marvell/mwifiex/11n.c
+++ b/drivers/net/wireless/marvell/mwifiex/11n.c
@@ -392,12 +392,10 @@ mwifiex_cmd_append_11n_tlv(struct mwifiex_private *priv,
chan_list =
(struct mwifiex_ie_types_chan_list_param_set *) *buffer;
- memset(chan_list, 0,
- sizeof(struct mwifiex_ie_types_chan_list_param_set));
+ memset(chan_list, 0, struct_size(chan_list, chan_scan_param,
1));
chan_list->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
- chan_list->header.len = cpu_to_le16(
- sizeof(struct mwifiex_ie_types_chan_list_param_set) -
- sizeof(struct mwifiex_ie_types_header));
+ chan_list->header.len =
+ cpu_to_le16(sizeof(struct mwifiex_chan_scan_param_set));
chan_list->chan_scan_param[0].chan_number =
bss_desc->bcn_ht_oper->primary_chan;
chan_list->chan_scan_param[0].radio_type =
This probably still needs a bit more work.
There are a couple more instances of `sizeof()` that should probably be
audited and adjusted:
drivers/net/wireless/marvell/mwifiex/11n.c:414: *buffer +=
sizeof(struct mwifiex_ie_types_chan_list_param_set);
drivers/net/wireless/marvell/mwifiex/11n.c:415: ret_len +=
sizeof(struct mwifiex_ie_types_chan_list_param_set);
--
Gustavo
diff --git a/drivers/net/wireless/marvell/mwifiex/fw.h
b/drivers/net/wireless/marvell/mwifiex/fw.h
index 62f3c9a52a1d..3adc447b715f 100644
--- a/drivers/net/wireless/marvell/mwifiex/fw.h
+++ b/drivers/net/wireless/marvell/mwifiex/fw.h
@@ -770,7 +770,7 @@ struct mwifiex_chan_scan_param_set {
struct mwifiex_ie_types_chan_list_param_set {
struct mwifiex_ie_types_header header;
- struct mwifiex_chan_scan_param_set chan_scan_param[1];
+ struct mwifiex_chan_scan_param_set chan_scan_param[];
} __packed;
struct mwifiex_ie_types_rxba_sync {
diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c
b/drivers/net/wireless/marvell/mwifiex/scan.c
index a2ddac363b10..0326b121747c 100644
--- a/drivers/net/wireless/marvell/mwifiex/scan.c
+++ b/drivers/net/wireless/marvell/mwifiex/scan.c
@@ -664,15 +664,14 @@ mwifiex_scan_channel_list(struct mwifiex_private *priv,
/* Copy the current channel TLV to the command being
prepared */
- memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
+ memcpy(&chan_tlv_out->chan_scan_param[tlv_idx],
tmp_chan_list,
- sizeof(chan_tlv_out->chan_scan_param));
+ sizeof(*chan_tlv_out->chan_scan_param));
/* Increment the TLV header length by the size
appended */
le16_unaligned_add_cpu(&chan_tlv_out->header.len,
- sizeof(
- chan_tlv_out->chan_scan_param));
+
sizeof(*chan_tlv_out->chan_scan_param));
/*
* The tlv buffer length is set to the number of bytes
@@ -2369,12 +2368,11 @@ int mwifiex_cmd_802_11_bg_scan_config(struct
mwifiex_private *priv,
chan_idx < MWIFIEX_BG_SCAN_CHAN_MAX &&
bgscan_cfg_in->chan_list[chan_idx].chan_number;
chan_idx++) {
- temp_chan = chan_list_tlv->chan_scan_param + chan_idx;
+ temp_chan = &chan_list_tlv->chan_scan_param[chan_idx];
/* Increment the TLV header length by size appended */
le16_unaligned_add_cpu(&chan_list_tlv->header.len,
- sizeof(
- chan_list_tlv->chan_scan_param));
+
sizeof(*chan_list_tlv->chan_scan_param));
temp_chan->chan_number =
bgscan_cfg_in->chan_list[chan_idx].chan_number;
@@ -2413,7 +2411,7 @@ int mwifiex_cmd_802_11_bg_scan_config(struct
mwifiex_private *priv,
chan_scan_param);
le16_unaligned_add_cpu(&chan_list_tlv->header.len,
chan_num *
- sizeof(chan_list_tlv->chan_scan_param[0]));
+ sizeof(*chan_list_tlv->chan_scan_param));
}
tlv_pos += (sizeof(chan_list_tlv->header)
