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wifi: wilc1000: avoid buffer overflow in WID string configuration

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[ Upstream commit fe9e4d0c39311d0f97b024147a0d155333f388b5 ]

Fix the following copy overflow warning identified by Smatch checker.

 drivers/net/wireless/microchip/wilc1000/wlan_cfg.c:184 wilc_wlan_parse_response_frame()
        error: '__memcpy()' 'cfg->s[i]->str' copy overflow (512 vs 65537)

This patch introduces size check before accessing the memory buffer.
The checks are base on the WID type of received data from the firmware.
For WID string configuration, the size limit is determined by individual
element size in 'struct wilc_cfg_str_vals' that is maintained in 'len' field
of 'struct wilc_cfg_str'.

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/linux-wireless/aLFbr9Yu9j_TQTey@stanley.mountain
Suggested-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Link: https://patch.msgid.link/20250829225829.5423-1-ajay.kathat@microchip.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ajay.Kathat@microchip.com 2025-08-29 22:58:43 +00:00 committed by Greg Kroah-Hartman
parent f1e375d5eb
commit 2203ef4170
2 changed files with 31 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/net/wireless/microchip/wilc1000/wlan_cfg.c
View File

@ -41,10 +41,10 @@ static const struct wilc_cfg_word g_cfg_word[] = {
};
static const struct wilc_cfg_str g_cfg_str[] = {
{WID_FIRMWARE_VERSION, NULL},
{WID_MAC_ADDR, NULL},
{WID_ASSOC_RES_INFO, NULL},
{WID_NIL, NULL}
{WID_FIRMWARE_VERSION, 0, NULL},
{WID_MAC_ADDR, 0, NULL},
{WID_ASSOC_RES_INFO, 0, NULL},
{WID_NIL, 0, NULL}
};
#define WILC_RESP_MSG_TYPE_CONFIG_REPLY 'R'
@ -147,44 +147,58 @@ static void wilc_wlan_parse_response_frame(struct wilc *wl, u8 *info, int size)
switch (FIELD_GET(WILC_WID_TYPE, wid)) {
case WID_CHAR:
len = 3;
if (len + 2 > size)
return;
while (cfg->b[i].id != WID_NIL && cfg->b[i].id != wid)
i++;
if (cfg->b[i].id == wid)
cfg->b[i].val = info[4];
len = 3;
break;
case WID_SHORT:
len = 4;
if (len + 2 > size)
return;
while (cfg->hw[i].id != WID_NIL && cfg->hw[i].id != wid)
i++;
if (cfg->hw[i].id == wid)
cfg->hw[i].val = get_unaligned_le16(&info[4]);
len = 4;
break;
case WID_INT:
len = 6;
if (len + 2 > size)
return;
while (cfg->w[i].id != WID_NIL && cfg->w[i].id != wid)
i++;
if (cfg->w[i].id == wid)
cfg->w[i].val = get_unaligned_le32(&info[4]);
len = 6;
break;
case WID_STR:
len = 2 + get_unaligned_le16(&info[2]);
while (cfg->s[i].id != WID_NIL && cfg->s[i].id != wid)
i++;
if (cfg->s[i].id == wid)
memcpy(cfg->s[i].str, &info[2],
get_unaligned_le16(&info[2]) + 2);
if (cfg->s[i].id == wid) {
if (len > cfg->s[i].len || (len + 2 > size))
return;
memcpy(cfg->s[i].str, &info[2],
len);
}
len = 2 + get_unaligned_le16(&info[2]);
break;
default:
@ -384,12 +398,15 @@ int wilc_wlan_cfg_init(struct wilc *wl)
/* store the string cfg parameters */
wl->cfg.s[i].id = WID_FIRMWARE_VERSION;
wl->cfg.s[i].str = str_vals->firmware_version;
wl->cfg.s[i].len = sizeof(str_vals->firmware_version);
i++;
wl->cfg.s[i].id = WID_MAC_ADDR;
wl->cfg.s[i].str = str_vals->mac_address;
wl->cfg.s[i].len = sizeof(str_vals->mac_address);
i++;
wl->cfg.s[i].id = WID_ASSOC_RES_INFO;
wl->cfg.s[i].str = str_vals->assoc_rsp;
wl->cfg.s[i].len = sizeof(str_vals->assoc_rsp);
i++;
wl->cfg.s[i].id = WID_NIL;
wl->cfg.s[i].str = NULL;

5
drivers/net/wireless/microchip/wilc1000/wlan_cfg.h
View File

@ -24,12 +24,13 @@ struct wilc_cfg_word {
struct wilc_cfg_str {
u16 id;
u16 len;
u8 *str;
};
struct wilc_cfg_str_vals {
u8 mac_address[7];
u8 firmware_version[129];
u8 mac_address[8];
u8 firmware_version[130];
u8 assoc_rsp[WILC_MAX_ASSOC_RESP_FRAME_SIZE];
};