From: Phil Turnbull philipturnbull@github.com
stable inclusion from stable-v5.10.157 commit 3eb6b89a4e9f9e44c3170d70d8d16c3c8dc8c800 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I66LQ3?from=project-issue CVE: CVE-2022-47518
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 0cdfa9e6f0915e3d243e2393bfa8a22e12d553b0 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Ziyang Xuan william.xuanziyang@huawei.com Reviewed-by: Yue Haibing yuehaibing@huawei.com Reviewed-by: Xiu Jianfeng xiujianfeng@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- .../wireless/microchip/wilc1000/cfg80211.c | 23 ++++++++++++++----- 1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/net/wireless/microchip/wilc1000/cfg80211.c b/drivers/net/wireless/microchip/wilc1000/cfg80211.c index b42e9eb2631c..64e01b84d98d 100644 --- a/drivers/net/wireless/microchip/wilc1000/cfg80211.c +++ b/drivers/net/wireless/microchip/wilc1000/cfg80211.c @@ -960,19 +960,30 @@ 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; + unsigned 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 (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; } }