2019-03-12 04:41:07

by Kangjie Lu

Subject: [PATCH v2] net: brcm80211: fix missing checks for kmemdup

In case kmemdup fails, the fix sets conn_info->req_ie_len to zero
to avoid buffer overflows.

Signed-off-by: Kangjie Lu <[email protected]>
---
drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index e92f6351bd22..5d9a3c35fef5 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -5464,6 +5464,8 @@ static s32 brcmf_get_assoc_ies(struct brcmf_cfg80211_info *cfg,
conn_info->req_ie =
kmemdup(cfg->extra_buf, conn_info->req_ie_len,
GFP_KERNEL);
+ if (!conn_info->req_ie)
+ conn_info->req_ie_len = 0;
} else {
conn_info->req_ie_len = 0;
conn_info->req_ie = NULL;
@@ -5480,6 +5482,8 @@ static s32 brcmf_get_assoc_ies(struct brcmf_cfg80211_info *cfg,
conn_info->resp_ie =
kmemdup(cfg->extra_buf, conn_info->resp_ie_len,
GFP_KERNEL);
+ if (!conn_info->resp_ie)
+ conn_info->req_ie_len = 0;
} else {
conn_info->resp_ie_len = 0;
conn_info->resp_ie = NULL;
--
2.17.1

2019-03-15 09:51:54

by Arend Van Spriel

Subject: Re: [PATCH v2] net: brcm80211: fix missing checks for kmemdup

On 3/12/2019 5:39 AM, Kangjie Lu wrote:
> In case kmemdup fails, the fix sets conn_info->req_ie_len to zero
> to avoid buffer overflows.

Hi Kangjie,

See comment below. Also for v3 change prefix 'net:brcm80211:' to
'brcmfmac:' instead.

> Signed-off-by: Kangjie Lu <[email protected]>
> ---
> drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> index e92f6351bd22..5d9a3c35fef5 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
> @@ -5464,6 +5464,8 @@ static s32 brcmf_get_assoc_ies(struct brcmf_cfg80211_info *cfg,
> conn_info->req_ie =
> kmemdup(cfg->extra_buf, conn_info->req_ie_len,
> GFP_KERNEL);
> + if (!conn_info->req_ie)
> + conn_info->req_ie_len = 0;

good.

> } else {
> conn_info->req_ie_len = 0;
> conn_info->req_ie = NULL;
> @@ -5480,6 +5482,8 @@ static s32 brcmf_get_assoc_ies(struct brcmf_cfg80211_info *cfg,
> conn_info->resp_ie =
> kmemdup(cfg->extra_buf, conn_info->resp_ie_len,
> GFP_KERNEL);
> + if (!conn_info->resp_ie)
> + conn_info->req_ie_len = 0;

bad! I think you took my comment too literal. Here it should set
conn_info->resp_ie_len to zero.

Regards,
Arend

> } else {
> conn_info->resp_ie_len = 0;
> conn_info->resp_ie = NULL;
>

2019-03-15 17:07:14

by Kangjie Lu

Subject: [PATCH v3] brcmfmac: fix missing checks for kmemdup

In case kmemdup fails, the fix sets conn_info->req_ie_len and
conn_info->resp_ie_len to zero to avoid buffer overflows.

Signed-off-by: Kangjie Lu <[email protected]>
---
drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index e92f6351bd22..8ee8af4e7ec4 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -5464,6 +5464,8 @@ static s32 brcmf_get_assoc_ies(struct brcmf_cfg80211_info *cfg,
conn_info->req_ie =
kmemdup(cfg->extra_buf, conn_info->req_ie_len,
GFP_KERNEL);
+ if (!conn_info->req_ie)
+ conn_info->req_ie_len = 0;
} else {
conn_info->req_ie_len = 0;
conn_info->req_ie = NULL;
@@ -5480,6 +5482,8 @@ static s32 brcmf_get_assoc_ies(struct brcmf_cfg80211_info *cfg,
conn_info->resp_ie =
kmemdup(cfg->extra_buf, conn_info->resp_ie_len,
GFP_KERNEL);
+ if (!conn_info->resp_ie)
+ conn_info->resp_ie_len = 0;
} else {
conn_info->resp_ie_len = 0;
conn_info->resp_ie = NULL;
--
2.17.1

2019-03-15 23:02:41

by Arend Van Spriel

Subject: Re: [PATCH v3] brcmfmac: fix missing checks for kmemdup

On 3/15/2019 6:04 PM, Kangjie Lu wrote:
> In case kmemdup fails, the fix sets conn_info->req_ie_len and
> conn_info->resp_ie_len to zero to avoid buffer overflows.

Acked-by: Arend van Spriel <[email protected]>
> Signed-off-by: Kangjie Lu <[email protected]>
> ---
> drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 4 ++++
> 1 file changed, 4 insertions(+)

2019-04-04 10:16:00

by Kalle Valo

Subject: Re: [PATCH v3] brcmfmac: fix missing checks for kmemdup

Kangjie Lu <[email protected]> wrote:

> In case kmemdup fails, the fix sets conn_info->req_ie_len and
> conn_info->resp_ie_len to zero to avoid buffer overflows.
>
> Signed-off-by: Kangjie Lu <[email protected]>
> Acked-by: Arend van Spriel <[email protected]>

Patch applied to wireless-drivers-next.git, thanks.

46953f97224d brcmfmac: fix missing checks for kmemdup

--
https://patchwork.kernel.org/patch/10855341/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches