[PATCH] brcmsmac: fix potential memory leak in wlc_phy_attach_lcnphy

[PATCH] brcmsmac: fix potential memory leak in wlc_phy_attach_lcnphy

[Keita Suzuki]

When wlc_phy_txpwr_srom_read_lcnphy fails in wlc_phy_attach_lcnphy,
the allocated pi->u.pi_lcnphy is leaked, since struct brcms_phy will be
freed in the caller function.

Fix this by calling wlc_phy_detach_lcnphy in the error handler of
wlc_phy_txpwr_srom_read_lcnphy before returning.

Signed-off-by: Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp>
---
 .../net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
index 7ef36234a25d..6d70f51b2ddf 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
@@ -5065,8 +5065,10 @@ bool wlc_phy_attach_lcnphy(struct brcms_phy *pi)
 	pi->pi_fptr.radioloftget = wlc_lcnphy_get_radio_loft;
 	pi->pi_fptr.detach = wlc_phy_detach_lcnphy;
 
-	if (!wlc_phy_txpwr_srom_read_lcnphy(pi))
+	if (!wlc_phy_txpwr_srom_read_lcnphy(pi)) {
+		wlc_phy_detach_lcnphy(pi);
 		return false;
+	}
 
 	if (LCNREV_IS(pi->pubpi.phy_rev, 1)) {
 		if (pi_lcn->lcnphy_tempsense_option == 3) {
-- 
2.17.1

Re: [PATCH] brcmsmac: fix potential memory leak in wlc_phy_attach_lcnphy

[Arend Van Spriel]

On 9/7/2020 6:22 PM, Keita Suzuki wrote:
> When wlc_phy_txpwr_srom_read_lcnphy fails in wlc_phy_attach_lcnphy,
> the allocated pi->u.pi_lcnphy is leaked, since struct brcms_phy will be
> freed in the caller function.
> 
> Fix this by calling wlc_phy_detach_lcnphy in the error handler of
> wlc_phy_txpwr_srom_read_lcnphy before returning.
> 
> Signed-off-by: Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp>
> ---
>   .../net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c    | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
> index 7ef36234a25d..6d70f51b2ddf 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
> @@ -5065,8 +5065,10 @@ bool wlc_phy_attach_lcnphy(struct brcms_phy *pi)
>   	pi->pi_fptr.radioloftget = wlc_lcnphy_get_radio_loft;
>   	pi->pi_fptr.detach = wlc_phy_detach_lcnphy;
>   
> -	if (!wlc_phy_txpwr_srom_read_lcnphy(pi))
> +	if (!wlc_phy_txpwr_srom_read_lcnphy(pi)) {
> +		wlc_phy_detach_lcnphy(pi);

Essentially the same but I prefer to simply do the kfree() call directly 
here as we also allocate in this function.

Thanks,
Arend

[PATCH] brcmsmac: fix memory leak in wlc_phy_attach_lcnphy

[Keita Suzuki]

When wlc_phy_txpwr_srom_read_lcnphy fails in wlc_phy_attach_lcnphy,
the allocated pi->u.pi_lcnphy is leaked, since struct brcms_phy will be
freed in the caller function.

Fix this by calling wlc_phy_detach_lcnphy in the error handler of
wlc_phy_txpwr_srom_read_lcnphy before returning.

Signed-off-by: Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp>
---
 .../net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
index 7ef36234a25d..66797dc5e90d 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
@@ -5065,8 +5065,10 @@ bool wlc_phy_attach_lcnphy(struct brcms_phy *pi)
 	pi->pi_fptr.radioloftget = wlc_lcnphy_get_radio_loft;
 	pi->pi_fptr.detach = wlc_phy_detach_lcnphy;
 
-	if (!wlc_phy_txpwr_srom_read_lcnphy(pi))
+	if (!wlc_phy_txpwr_srom_read_lcnphy(pi)) {
+		kfree(pi->u.pi_lcnphy);
 		return false;
+	}
 
 	if (LCNREV_IS(pi->pubpi.phy_rev, 1)) {
 		if (pi_lcn->lcnphy_tempsense_option == 3) {
-- 
2.17.1

Re: [PATCH] brcmsmac: fix memory leak in wlc_phy_attach_lcnphy

[Arend Van Spriel]

On 9/8/2020 2:13 AM, Keita Suzuki wrote:
> When wlc_phy_txpwr_srom_read_lcnphy fails in wlc_phy_attach_lcnphy,
> the allocated pi->u.pi_lcnphy is leaked, since struct brcms_phy will be
> freed in the caller function.
> 
> Fix this by calling wlc_phy_detach_lcnphy in the error handler of
> wlc_phy_txpwr_srom_read_lcnphy before returning.

Thanks for resubmitting the patch addressing my comment. For clarity it 
is recommended to mark the subject with '[PATCH V2]' and add a ...

> Signed-off-by: Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp>
> ---
... changelog here describing difference between previous patch and this 
version.

Regards,
Arend
---
>   .../net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c    | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)

Re: [PATCH] brcmsmac: fix memory leak in wlc_phy_attach_lcnphy

[Keita Suzuki]

Thank you for your comment. I am relatively new to the Linux
kernel community, so I am more than happy to receive comments.
Please let me know if I'm violating any other rules.

> > Signed-off-by: Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp>
> > ---
> ... changelog here describing difference between previous patch and this
> version.

I will re-send the patch with the change log.

Thanks,
Keita

2020年9月8日(火) 20:18 Arend Van Spriel <arend.vanspriel@broadcom.com>:
>
> On 9/8/2020 2:13 AM, Keita Suzuki wrote:
> > When wlc_phy_txpwr_srom_read_lcnphy fails in wlc_phy_attach_lcnphy,
> > the allocated pi->u.pi_lcnphy is leaked, since struct brcms_phy will be
> > freed in the caller function.
> >
> > Fix this by calling wlc_phy_detach_lcnphy in the error handler of
> > wlc_phy_txpwr_srom_read_lcnphy before returning.
>
> Thanks for resubmitting the patch addressing my comment. For clarity it
> is recommended to mark the subject with '[PATCH V2]' and add a ...
>
> > Signed-off-by: Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp>
> > ---
> ... changelog here describing difference between previous patch and this
> version.
>
> Regards,
> Arend
> ---
> >   .../net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c    | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)

Re: [PATCH] brcmsmac: fix memory leak in wlc_phy_attach_lcnphy

[Arend Van Spriel]

On 9/8/2020 2:02 PM, Keita Suzuki wrote:
> Thank you for your comment. I am relatively new to the Linux
> kernel community, so I am more than happy to receive comments.
> Please let me know if I'm violating any other rules.

Sure ;-)

Here a useful link that Kalle (wireless drivers maintainer) is always 
sharing in his email signature:

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

Regards,
Arend

[PATCH v2] brcmsmac: fix memory leak in wlc_phy_attach_lcnphy

[Keita Suzuki]

When wlc_phy_txpwr_srom_read_lcnphy fails in wlc_phy_attach_lcnphy,
the allocated pi->u.pi_lcnphy is leaked, since struct brcms_phy will be
freed in the caller function.

Fix this by calling wlc_phy_detach_lcnphy in the error handler of
wlc_phy_txpwr_srom_read_lcnphy before returning.

Signed-off-by: Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp>
---
changelog(v2): change call from wlc_phy_detach_lcnphy() to kfree()

 .../net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
index 7ef36234a25d..66797dc5e90d 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.c
@@ -5065,8 +5065,10 @@ bool wlc_phy_attach_lcnphy(struct brcms_phy *pi)
 	pi->pi_fptr.radioloftget = wlc_lcnphy_get_radio_loft;
 	pi->pi_fptr.detach = wlc_phy_detach_lcnphy;
 
-	if (!wlc_phy_txpwr_srom_read_lcnphy(pi))
+	if (!wlc_phy_txpwr_srom_read_lcnphy(pi)) {
+		kfree(pi->u.pi_lcnphy);
 		return false;
+	}
 
 	if (LCNREV_IS(pi->pubpi.phy_rev, 1)) {
 		if (pi_lcn->lcnphy_tempsense_option == 3) {
-- 
2.17.1

Re: [PATCH v2] brcmsmac: fix memory leak in wlc_phy_attach_lcnphy

[Kalle Valo]

Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp> wrote:

> When wlc_phy_txpwr_srom_read_lcnphy fails in wlc_phy_attach_lcnphy,
> the allocated pi->u.pi_lcnphy is leaked, since struct brcms_phy will be
> freed in the caller function.
> 
> Fix this by calling wlc_phy_detach_lcnphy in the error handler of
> wlc_phy_txpwr_srom_read_lcnphy before returning.
> 
> Signed-off-by: Keita Suzuki <keitasuzuki.park@sslab.ics.keio.ac.jp>

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

f4443293d741 brcmsmac: fix memory leak in wlc_phy_attach_lcnphy

-- 
https://patchwork.kernel.org/patch/11763749/

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