[PATCH v3 1/3] net: dsa: ksz: Check return value

[PATCH v3 1/3] net: dsa: ksz: Check return value

[Artem Chernyshev]

Return NULL if we got unexpected value from skb_trim_rcsum() 
in ksz_common_rcv()

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: bafe9ba7d908 ("net: dsa: ksz: Factor out common tag code")
Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
---
V1->V2 Fixes for tag_hellcreek.c and tag_sja1105.c
V2->V3 Split patch in 3 separate parts

 net/dsa/tag_ksz.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 38fa19c1e2d5..429250298ac4 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -21,7 +21,8 @@ static struct sk_buff *ksz_common_rcv(struct sk_buff *skb,
 	if (!skb->dev)
 		return NULL;
 
-	pskb_trim_rcsum(skb, skb->len - len);
+	if (pskb_trim_rcsum(skb, skb->len - len))
+		return NULL;
 
 	dsa_default_offload_fwd_mark(skb);
 
-- 
2.30.3

[PATCH v3 2/3] net: dsa: hellcreek: Check return value

[Artem Chernyshev]

Return NULL if we got unexpected value from skb_trim_rcsum() 
in hellcreek_rcv()

Fixes: 01ef09caad66 ("net: dsa: Add tag handling for Hirschmann Hellcreek switches")
Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
---
V1->V2 Fixes for tag_hellcreek.c and tag_sja1105.c
V2->V3 Split patch in 3 separate parts

 net/dsa/tag_hellcreek.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/dsa/tag_hellcreek.c b/net/dsa/tag_hellcreek.c
index 846588c0070a..53a206d11685 100644
--- a/net/dsa/tag_hellcreek.c
+++ b/net/dsa/tag_hellcreek.c
@@ -49,7 +49,8 @@ static struct sk_buff *hellcreek_rcv(struct sk_buff *skb,
 		return NULL;
 	}
 
-	pskb_trim_rcsum(skb, skb->len - HELLCREEK_TAG_LEN);
+	if (pskb_trim_rcsum(skb, skb->len - HELLCREEK_TAG_LEN))
+		return NULL;
 
 	dsa_default_offload_fwd_mark(skb);
 
-- 
2.30.3

[PATCH v3 3/3] net: dsa: sja1105: Check return value

[Artem Chernyshev]

Return NULL if we got unexpected value from skb_trim_rcsum() in 
sja1110_rcv_inband_control_extension()

Fixes: 4913b8ebf8a9 ("net: dsa: add support for the SJA1110 native tagging protocol")
Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
---
V1->V2 Fixes for tag_hellcreek.c and tag_sja1105.c
V2->V3 Split patch in 3 separate parts

 net/dsa/tag_sja1105.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/dsa/tag_sja1105.c b/net/dsa/tag_sja1105.c
index 83e4136516b0..1a85125bda6d 100644
--- a/net/dsa/tag_sja1105.c
+++ b/net/dsa/tag_sja1105.c
@@ -665,7 +665,8 @@ static struct sk_buff *sja1110_rcv_inband_control_extension(struct sk_buff *skb,
 		 * padding and trailer we need to account for the fact that
 		 * skb->data points to skb_mac_header(skb) + ETH_HLEN.
 		 */
-		pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN);
+		if (pskb_trim_rcsum(skb, start_of_padding - ETH_HLEN))
+			return NULL;
 	/* Trap-to-host frame, no timestamp trailer */
 	} else {
 		*source_port = SJA1110_RX_HEADER_SRC_PORT(rx_header);
-- 
2.30.3

Re: [PATCH v3 1/3] net: dsa: ksz: Check return value

[Florian Fainelli]

On 12/1/2022 6:00 AM, Artem Chernyshev wrote:
> Return NULL if we got unexpected value from skb_trim_rcsum()
> in ksz_common_rcv()
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: bafe9ba7d908 ("net: dsa: ksz: Factor out common tag code")
> Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
> Reviewed-by: Vladimir Oltean <olteanv@gmail.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

Re: [PATCH v3 2/3] net: dsa: hellcreek: Check return value

[Florian Fainelli]

On 12/1/2022 6:00 AM, Artem Chernyshev wrote:
> Return NULL if we got unexpected value from skb_trim_rcsum()
> in hellcreek_rcv()
> 
> Fixes: 01ef09caad66 ("net: dsa: Add tag handling for Hirschmann Hellcreek switches")
> Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

Re: [PATCH v3 3/3] net: dsa: sja1105: Check return value

[Florian Fainelli]

On 12/1/2022 6:00 AM, Artem Chernyshev wrote:
> Return NULL if we got unexpected value from skb_trim_rcsum() in
> sja1110_rcv_inband_control_extension()
> 
> Fixes: 4913b8ebf8a9 ("net: dsa: add support for the SJA1110 native tagging protocol")
> Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

Re: [PATCH v3 2/3] net: dsa: hellcreek: Check return value

[Kurt Kanzenbach]

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On Thu Dec 01 2022, Artem Chernyshev wrote:
> Return NULL if we got unexpected value from skb_trim_rcsum() 
                                              ^ pskb_trim_rcsum()
> in hellcreek_rcv()

For the next time, a change log should rather explain *why* a change is
made instead of *what* the patch is doing.

Other than that,

Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>

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Re: [PATCH v3 1/3] net: dsa: ksz: Check return value

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Thu,  1 Dec 2022 17:00:30 +0300 you wrote:
> Return NULL if we got unexpected value from skb_trim_rcsum()
> in ksz_common_rcv()
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: bafe9ba7d908 ("net: dsa: ksz: Factor out common tag code")
> Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru>
> Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
> 
> [...]

Here is the summary with links:
  - [v3,1/3] net: dsa: ksz: Check return value
    https://git.kernel.org/netdev/net/c/3d8fdcbf1f42
  - [v3,2/3] net: dsa: hellcreek: Check return value
    https://git.kernel.org/netdev/net/c/d4edb5068865
  - [v3,3/3] net: dsa: sja1105: Check return value
    https://git.kernel.org/netdev/net/c/8948876335b1

You are awesome, thank you!
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