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wifi: wilc1000: validate number of channels

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There is no validation of 'e->no_of_channels' which can trigger an
out-of-bounds write in the following 'memset' call. Validate that the
number of channels does not extends beyond the size of the channel list
element.

Signed-off-by: Phil Turnbull <philipturnbull@github.com>
Tested-by: Ajay Kathat <ajay.kathat@microchip.com>
Acked-by: Ajay Kathat <ajay.kathat@microchip.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20221123153543.8568-5-philipturnbull@github.com
This commit is contained in:
Phil Turnbull 2022-11-23 10:35:43 -05:00 committed by Kalle Valo
parent f9b62f9843
commit 0cdfa9e6f0
1 changed files with 16 additions and 6 deletions
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22
drivers/net/wireless/microchip/wilc1000/cfg80211.c
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@ -981,19 +981,29 @@ static inline void wilc_wfi_cfg_parse_ch_attr(u8 *buf, u32 len, u8 sta_ch)
}
if (ch_list_idx) {
u16 attr_size;
struct wilc_ch_list_elem *e;
int i;
u16 elem_size;
ch_list = (struct wilc_attr_ch_list *)&buf[ch_list_idx];
attr_size = le16_to_cpu(ch_list->attr_len);
for (i = 0; i < attr_size;) {
/* the number of bytes following the final 'elem' member */
elem_size = le16_to_cpu(ch_list->attr_len) -
(sizeof(*ch_list) - sizeof(struct wilc_attr_entry));
for (unsigned int i = 0; i < elem_size;) {
struct wilc_ch_list_elem *e;
e = (struct wilc_ch_list_elem *)(ch_list->elem + i);
i += sizeof(*e);
if (i > elem_size)
break;
i += e->no_of_channels;
if (i > elem_size)
break;
if (e->op_class == WILC_WLAN_OPERATING_CLASS_2_4GHZ) {
memset(e->ch_list, sta_ch, e->no_of_channels);
break;
}
i += e->no_of_channels;
}
}