* [PATCH] wifi: mt76: add a check of vzalloc in mt7615_coredump_work
@ 2023-02-27 11:57 Kang Chen
2023-02-27 13:33 ` Lorenzo Bianconi
0 siblings, 1 reply; 7+ messages in thread
From: Kang Chen @ 2023-02-27 11:57 UTC (permalink / raw)
To: shayne.chen
Cc: sean.wang, kvalo, nbd, lorenzo, ryder.lee, davem, edumazet, kuba,
pabeni, matthias.bgg, angelogioacchino.delregno, linux-wireless,
netdev, linux-kernel, linux-arm-kernel, linux-mediatek, Kang Chen
vzalloc may fails, dump might be null and will cause
illegal address access later.
Signed-off-by: Kang Chen <void0red@gmail.com>
---
drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index a95602473..73d84c301 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@ -2367,6 +2367,9 @@ void mt7615_coredump_work(struct work_struct *work)
}
dump = vzalloc(MT76_CONNAC_COREDUMP_SZ);
+ if (!dump)
+ return;
+
data = dump;
while (true) {
--
2.34.1
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^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [PATCH] wifi: mt76: add a check of vzalloc in mt7615_coredump_work
2023-02-27 11:57 [PATCH] wifi: mt76: add a check of vzalloc in mt7615_coredump_work Kang Chen
@ 2023-02-27 13:33 ` Lorenzo Bianconi
2023-02-27 13:52 ` [PATCH v2] " void0red
0 siblings, 1 reply; 7+ messages in thread
From: Lorenzo Bianconi @ 2023-02-27 13:33 UTC (permalink / raw)
To: Kang Chen
Cc: shayne.chen, sean.wang, kvalo, nbd, lorenzo, ryder.lee, davem,
edumazet, kuba, pabeni, matthias.bgg, angelogioacchino.delregno,
linux-wireless, netdev, linux-kernel, linux-arm-kernel,
linux-mediatek
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> vzalloc may fails, dump might be null and will cause
> illegal address access later.
can you please add a Fixes tag?
Regards,
Lorenzo
>
> Signed-off-by: Kang Chen <void0red@gmail.com>
> ---
> drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> index a95602473..73d84c301 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> @@ -2367,6 +2367,9 @@ void mt7615_coredump_work(struct work_struct *work)
> }
>
> dump = vzalloc(MT76_CONNAC_COREDUMP_SZ);
> + if (!dump)
> + return;
> +
> data = dump;
>
> while (true) {
> --
> 2.34.1
>
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^ permalink raw reply [flat|nested] 7+ messages in thread* [PATCH v2] wifi: mt76: add a check of vzalloc in mt7615_coredump_work
2023-02-27 13:33 ` Lorenzo Bianconi
@ 2023-02-27 13:52 ` void0red
2023-02-27 14:06 ` Lorenzo Bianconi
0 siblings, 1 reply; 7+ messages in thread
From: void0red @ 2023-02-27 13:52 UTC (permalink / raw)
To: lorenzo.bianconi
Cc: angelogioacchino.delregno, davem, edumazet, kuba, kvalo,
linux-arm-kernel, linux-kernel, linux-mediatek, linux-wireless,
lorenzo, matthias.bgg, nbd, netdev, pabeni, ryder.lee, sean.wang,
shayne.chen, void0red
From: Kang Chen <void0red@gmail.com>
vzalloc may fails, dump might be null and will cause
illegal address access later.
Fixes: d2bf7959d9c0 ("mt76: mt7663: introduce coredump support")
Signed-off-by: Kang Chen <void0red@gmail.com>
---
v2 -> v1: add Fixes tag
drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index a95602473..73d84c301 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@ -2367,6 +2367,9 @@ void mt7615_coredump_work(struct work_struct *work)
}
dump = vzalloc(MT76_CONNAC_COREDUMP_SZ);
+ if (!dump)
+ return;
+
data = dump;
while (true) {
--
2.34.1
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^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [PATCH v2] wifi: mt76: add a check of vzalloc in mt7615_coredump_work
2023-02-27 13:52 ` [PATCH v2] " void0red
@ 2023-02-27 14:06 ` Lorenzo Bianconi
2023-02-27 14:28 ` Kang Chen
2023-02-27 14:48 ` [PATCH v3] wifi: mt76: handle failure " void0red
0 siblings, 2 replies; 7+ messages in thread
From: Lorenzo Bianconi @ 2023-02-27 14:06 UTC (permalink / raw)
To: void0red
Cc: angelogioacchino.delregno, davem, edumazet, kuba, kvalo,
linux-arm-kernel, linux-kernel, linux-mediatek, linux-wireless,
lorenzo, matthias.bgg, nbd, netdev, pabeni, ryder.lee, sean.wang,
shayne.chen
[-- Attachment #1.1: Type: text/plain, Size: 1082 bytes --]
> From: Kang Chen <void0red@gmail.com>
>
> vzalloc may fails, dump might be null and will cause
> illegal address access later.
>
> Fixes: d2bf7959d9c0 ("mt76: mt7663: introduce coredump support")
> Signed-off-by: Kang Chen <void0red@gmail.com>
> ---
> v2 -> v1: add Fixes tag
>
> drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> index a95602473..73d84c301 100644
> --- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> @@ -2367,6 +2367,9 @@ void mt7615_coredump_work(struct work_struct *work)
> }
>
> dump = vzalloc(MT76_CONNAC_COREDUMP_SZ);
> + if (!dump)
> + return;
> +
> data = dump;
>
> while (true) {
> --
> 2.34.1
>
revieweing the code I guess the right approach would be the one used in
mt7921_coredump_work():
- free pending skbs
- not run dev_coredumpv()
What do you think?
Regards,
Lorenzo
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^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [PATCH v2] wifi: mt76: add a check of vzalloc in mt7615_coredump_work
2023-02-27 14:06 ` Lorenzo Bianconi
@ 2023-02-27 14:28 ` Kang Chen
2023-02-27 14:48 ` [PATCH v3] wifi: mt76: handle failure " void0red
1 sibling, 0 replies; 7+ messages in thread
From: Kang Chen @ 2023-02-27 14:28 UTC (permalink / raw)
To: Lorenzo Bianconi
Cc: angelogioacchino.delregno, davem, edumazet, kuba, kvalo,
linux-arm-kernel, linux-kernel, linux-mediatek, linux-wireless,
lorenzo, matthias.bgg, nbd, netdev, pabeni, ryder.lee, sean.wang,
shayne.chen
Hi, Lorenzo
Thanks for your suggestions.
I totally agree with you.
Best regards,
Kang Chen
On Mon, Feb 27, 2023 at 10:07 PM Lorenzo Bianconi
<lorenzo.bianconi@redhat.com> wrote:
>
> > From: Kang Chen <void0red@gmail.com>
> >
> > vzalloc may fails, dump might be null and will cause
> > illegal address access later.
> >
> > Fixes: d2bf7959d9c0 ("mt76: mt7663: introduce coredump support")
> > Signed-off-by: Kang Chen <void0red@gmail.com>
> > ---
> > v2 -> v1: add Fixes tag
> >
> > drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> > index a95602473..73d84c301 100644
> > --- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> > +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
> > @@ -2367,6 +2367,9 @@ void mt7615_coredump_work(struct work_struct *work)
> > }
> >
> > dump = vzalloc(MT76_CONNAC_COREDUMP_SZ);
> > + if (!dump)
> > + return;
> > +
> > data = dump;
> >
> > while (true) {
> > --
> > 2.34.1
> >
>
> revieweing the code I guess the right approach would be the one used in
> mt7921_coredump_work():
> - free pending skbs
> - not run dev_coredumpv()
>
> What do you think?
>
> Regards,
> Lorenzo
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^ permalink raw reply [flat|nested] 7+ messages in thread* [PATCH v3] wifi: mt76: handle failure of vzalloc in mt7615_coredump_work
2023-02-27 14:06 ` Lorenzo Bianconi
2023-02-27 14:28 ` Kang Chen
@ 2023-02-27 14:48 ` void0red
2023-03-06 11:00 ` Simon Horman
1 sibling, 1 reply; 7+ messages in thread
From: void0red @ 2023-02-27 14:48 UTC (permalink / raw)
To: lorenzo.bianconi
Cc: angelogioacchino.delregno, davem, edumazet, kuba, kvalo,
linux-arm-kernel, linux-kernel, linux-mediatek, linux-wireless,
lorenzo, matthias.bgg, nbd, netdev, pabeni, ryder.lee, sean.wang,
shayne.chen, void0red
From: Kang Chen <void0red@gmail.com>
vzalloc may fails, dump might be null and will cause
illegal address access later.
Link: https://lore.kernel.org/all/Y%2Fy5Asxw3T3m4jCw@lore-desk
Fixes: d2bf7959d9c0 ("mt76: mt7663: introduce coredump support")
Signed-off-by: Kang Chen <void0red@gmail.com>
---
v3 -> v2: fix bugs
v2 -> v1: add Fixes tag
drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index a95602473..796768011 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@ -2380,7 +2380,7 @@ void mt7615_coredump_work(struct work_struct *work)
break;
skb_pull(skb, sizeof(struct mt7615_mcu_rxd));
- if (data + skb->len - dump > MT76_CONNAC_COREDUMP_SZ) {
+ if (!dump || data + skb->len - dump > MT76_CONNAC_COREDUMP_SZ) {
dev_kfree_skb(skb);
continue;
}
@@ -2390,6 +2390,8 @@ void mt7615_coredump_work(struct work_struct *work)
dev_kfree_skb(skb);
}
- dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ,
- GFP_KERNEL);
+
+ if (dump)
+ dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ,
+ GFP_KERNEL);
}
--
2.34.1
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^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [PATCH v3] wifi: mt76: handle failure of vzalloc in mt7615_coredump_work
2023-02-27 14:48 ` [PATCH v3] wifi: mt76: handle failure " void0red
@ 2023-03-06 11:00 ` Simon Horman
0 siblings, 0 replies; 7+ messages in thread
From: Simon Horman @ 2023-03-06 11:00 UTC (permalink / raw)
To: void0red
Cc: lorenzo.bianconi, angelogioacchino.delregno, davem, edumazet,
kuba, kvalo, linux-arm-kernel, linux-kernel, linux-mediatek,
linux-wireless, lorenzo, matthias.bgg, nbd, netdev, pabeni,
ryder.lee, sean.wang, shayne.chen
On Mon, Feb 27, 2023 at 10:48:23PM +0800, void0red wrote:
> From: Kang Chen <void0red@gmail.com>
>
> vzalloc may fails, dump might be null and will cause
> illegal address access later.
>
> Link: https://lore.kernel.org/all/Y%2Fy5Asxw3T3m4jCw@lore-desk
> Fixes: d2bf7959d9c0 ("mt76: mt7663: introduce coredump support")
> Signed-off-by: Kang Chen <void0red@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
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^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2023-03-06 11:01 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-02-27 11:57 [PATCH] wifi: mt76: add a check of vzalloc in mt7615_coredump_work Kang Chen
2023-02-27 13:33 ` Lorenzo Bianconi
2023-02-27 13:52 ` [PATCH v2] " void0red
2023-02-27 14:06 ` Lorenzo Bianconi
2023-02-27 14:28 ` Kang Chen
2023-02-27 14:48 ` [PATCH v3] wifi: mt76: handle failure " void0red
2023-03-06 11:00 ` Simon Horman
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