* [PATCH v2] wifi: rtw89: debug: Fix memory leak in __print_txpwr_map()
@ 2026-01-16 13:08 Zilin Guan
2026-01-20 3:27 ` Zong-Zhe Yang
2026-01-22 2:02 ` Ping-Ke Shih
0 siblings, 2 replies; 5+ messages in thread
From: Zilin Guan @ 2026-01-16 13:08 UTC (permalink / raw)
To: pkshih; +Cc: kevin_yang, linux-wireless, linux-kernel, jianhao.xu, Zilin Guan
In __print_txpwr_map(), memory is allocated to bufp via vzalloc().
If max_valid_addr is 0, the function returns -EOPNOTSUPP immediately
without freeing bufp, leading to a memory leak.
Since the validation of max_valid_addr does not depend on the allocated
memory, fix this by moving the vzalloc() call after the check.
Compile tested only. Issue found using a prototype static analysis tool
and code review.
Fixes: 036042e15770 ("wifi: rtw89: debug: txpwr table supports Wi-Fi 7 chips")
Suggested-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
---
Changes in v2:
- Move memory allocation after validation check to avoid leak.
drivers/net/wireless/realtek/rtw89/debug.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtw89/debug.c b/drivers/net/wireless/realtek/rtw89/debug.c
index 1264c2f82600..987eef8170f2 100644
--- a/drivers/net/wireless/realtek/rtw89/debug.c
+++ b/drivers/net/wireless/realtek/rtw89/debug.c
@@ -825,10 +825,6 @@ static ssize_t __print_txpwr_map(struct rtw89_dev *rtwdev, char *buf, size_t buf
s8 *bufp, tmp;
int ret;
- bufp = vzalloc(map->addr_to - map->addr_from + 4);
- if (!bufp)
- return -ENOMEM;
-
if (path_num == 1)
max_valid_addr = map->addr_to_1ss;
else
@@ -837,6 +833,10 @@ static ssize_t __print_txpwr_map(struct rtw89_dev *rtwdev, char *buf, size_t buf
if (max_valid_addr == 0)
return -EOPNOTSUPP;
+ bufp = vzalloc(map->addr_to - map->addr_from + 4);
+ if (!bufp)
+ return -ENOMEM;
+
for (addr = map->addr_from; addr <= max_valid_addr; addr += 4) {
ret = rtw89_mac_txpwr_read32(rtwdev, RTW89_PHY_0, addr, &val);
if (ret)
--
2.34.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* RE: [PATCH v2] wifi: rtw89: debug: Fix memory leak in __print_txpwr_map()
2026-01-16 13:08 [PATCH v2] wifi: rtw89: debug: Fix memory leak in __print_txpwr_map() Zilin Guan
@ 2026-01-20 3:27 ` Zong-Zhe Yang
2026-01-20 3:31 ` Ping-Ke Shih
2026-01-22 2:02 ` Ping-Ke Shih
1 sibling, 1 reply; 5+ messages in thread
From: Zong-Zhe Yang @ 2026-01-20 3:27 UTC (permalink / raw)
To: Zilin Guan, Ping-Ke Shih
Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
jianhao.xu@seu.edu.cn
Zilin Guan <zilin@seu.edu.cn> wrote:
>
> In __print_txpwr_map(), memory is allocated to bufp via vzalloc().
> If max_valid_addr is 0, the function returns -EOPNOTSUPP immediately
> without freeing bufp, leading to a memory leak.
>
> Since the validation of max_valid_addr does not depend on the allocated
> memory, fix this by moving the vzalloc() call after the check.
>
> Compile tested only. Issue found using a prototype static analysis tool
> and code review.
>
> Fixes: 036042e15770 ("wifi: rtw89: debug: txpwr table supports Wi-Fi 7 chips")
> Suggested-by: Zong-Zhe Yang <kevin_yang@realtek.com>
> Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
> ---
> Changes in v2:
> - Move memory allocation after validation check to avoid leak.
>
> drivers/net/wireless/realtek/rtw89/debug.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/wireless/realtek/rtw89/debug.c
> b/drivers/net/wireless/realtek/rtw89/debug.c
> index 1264c2f82600..987eef8170f2 100644
> --- a/drivers/net/wireless/realtek/rtw89/debug.c
> +++ b/drivers/net/wireless/realtek/rtw89/debug.c
> @@ -825,10 +825,6 @@ static ssize_t __print_txpwr_map(struct rtw89_dev *rtwdev, char
> *buf, size_t buf
> s8 *bufp, tmp;
> int ret;
>
> - bufp = vzalloc(map->addr_to - map->addr_from + 4);
> - if (!bufp)
> - return -ENOMEM;
> -
> if (path_num == 1)
> max_valid_addr = map->addr_to_1ss;
> else
> @@ -837,6 +833,10 @@ static ssize_t __print_txpwr_map(struct rtw89_dev *rtwdev, char
> *buf, size_t buf
> if (max_valid_addr == 0)
> return -EOPNOTSUPP;
>
> + bufp = vzalloc(map->addr_to - map->addr_from + 4);
> + if (!bufp)
> + return -ENOMEM;
> +
> for (addr = map->addr_from; addr <= max_valid_addr; addr += 4) {
> ret = rtw89_mac_txpwr_read32(rtwdev, RTW89_PHY_0, addr, &val);
> if (ret)
> --
> 2.34.1
Looks good to me.
Thanks.
^ permalink raw reply [flat|nested] 5+ messages in thread* RE: [PATCH v2] wifi: rtw89: debug: Fix memory leak in __print_txpwr_map()
2026-01-20 3:27 ` Zong-Zhe Yang
@ 2026-01-20 3:31 ` Ping-Ke Shih
2026-01-20 3:39 ` Zong-Zhe Yang
0 siblings, 1 reply; 5+ messages in thread
From: Ping-Ke Shih @ 2026-01-20 3:31 UTC (permalink / raw)
To: Zong-Zhe Yang, Zilin Guan
Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
jianhao.xu@seu.edu.cn
Zong-Zhe Yang <kevin_yang@realtek.com> wrote:
> Zilin Guan <zilin@seu.edu.cn> wrote:
> >
> > In __print_txpwr_map(), memory is allocated to bufp via vzalloc().
> > If max_valid_addr is 0, the function returns -EOPNOTSUPP immediately
> > without freeing bufp, leading to a memory leak.
> >
> > Since the validation of max_valid_addr does not depend on the allocated
> > memory, fix this by moving the vzalloc() call after the check.
> >
> > Compile tested only. Issue found using a prototype static analysis tool
> > and code review.
> >
> > Fixes: 036042e15770 ("wifi: rtw89: debug: txpwr table supports Wi-Fi 7 chips")
> > Suggested-by: Zong-Zhe Yang <kevin_yang@realtek.com>
> > Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
> > ---
> > Changes in v2:
> > - Move memory allocation after validation check to avoid leak.
> >
> > drivers/net/wireless/realtek/rtw89/debug.c | 8 ++++----
> > 1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/wireless/realtek/rtw89/debug.c
> > b/drivers/net/wireless/realtek/rtw89/debug.c
> > index 1264c2f82600..987eef8170f2 100644
> > --- a/drivers/net/wireless/realtek/rtw89/debug.c
> > +++ b/drivers/net/wireless/realtek/rtw89/debug.c
> > @@ -825,10 +825,6 @@ static ssize_t __print_txpwr_map(struct rtw89_dev *rtwdev, char
> > *buf, size_t buf
> > s8 *bufp, tmp;
> > int ret;
> >
> > - bufp = vzalloc(map->addr_to - map->addr_from + 4);
> > - if (!bufp)
> > - return -ENOMEM;
> > -
> > if (path_num == 1)
> > max_valid_addr = map->addr_to_1ss;
> > else
> > @@ -837,6 +833,10 @@ static ssize_t __print_txpwr_map(struct rtw89_dev *rtwdev, char
> > *buf, size_t buf
> > if (max_valid_addr == 0)
> > return -EOPNOTSUPP;
> >
> > + bufp = vzalloc(map->addr_to - map->addr_from + 4);
> > + if (!bufp)
> > + return -ENOMEM;
> > +
> > for (addr = map->addr_from; addr <= max_valid_addr; addr += 4) {
> > ret = rtw89_mac_txpwr_read32(rtwdev, RTW89_PHY_0, addr, &val);
> > if (ret)
> > --
> > 2.34.1
>
> Looks good to me.
I suppose I can add
Reviewed-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Okay?
^ permalink raw reply [flat|nested] 5+ messages in thread* RE: [PATCH v2] wifi: rtw89: debug: Fix memory leak in __print_txpwr_map()
2026-01-20 3:31 ` Ping-Ke Shih
@ 2026-01-20 3:39 ` Zong-Zhe Yang
0 siblings, 0 replies; 5+ messages in thread
From: Zong-Zhe Yang @ 2026-01-20 3:39 UTC (permalink / raw)
To: Ping-Ke Shih, Zilin Guan
Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
jianhao.xu@seu.edu.cn
Ping-Ke Shih <pkshih@realtek.com> wrote:
> Zong-Zhe Yang <kevin_yang@realtek.com> wrote:
> > Zilin Guan <zilin@seu.edu.cn> wrote:
> > >
> > > In __print_txpwr_map(), memory is allocated to bufp via vzalloc().
> > > If max_valid_addr is 0, the function returns -EOPNOTSUPP immediately
> > > without freeing bufp, leading to a memory leak.
> > >
> > > Since the validation of max_valid_addr does not depend on the allocated
> > > memory, fix this by moving the vzalloc() call after the check.
> > >
> > > Compile tested only. Issue found using a prototype static analysis tool
> > > and code review.
> > >
> > > Fixes: 036042e15770 ("wifi: rtw89: debug: txpwr table supports Wi-Fi 7 chips")
> > > Suggested-by: Zong-Zhe Yang <kevin_yang@realtek.com>
> > > Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
> > > ---
> > > Changes in v2:
> > > - Move memory allocation after validation check to avoid leak.
> > >
> > > drivers/net/wireless/realtek/rtw89/debug.c | 8 ++++----
> > > 1 file changed, 4 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/net/wireless/realtek/rtw89/debug.c
> > > b/drivers/net/wireless/realtek/rtw89/debug.c
> > > index 1264c2f82600..987eef8170f2 100644
> > > --- a/drivers/net/wireless/realtek/rtw89/debug.c
> > > +++ b/drivers/net/wireless/realtek/rtw89/debug.c
> > > @@ -825,10 +825,6 @@ static ssize_t __print_txpwr_map(struct rtw89_dev *rtwdev,
> char
> > > *buf, size_t buf
> > > s8 *bufp, tmp;
> > > int ret;
> > >
> > > - bufp = vzalloc(map->addr_to - map->addr_from + 4);
> > > - if (!bufp)
> > > - return -ENOMEM;
> > > -
> > > if (path_num == 1)
> > > max_valid_addr = map->addr_to_1ss;
> > > else
> > > @@ -837,6 +833,10 @@ static ssize_t __print_txpwr_map(struct rtw89_dev *rtwdev,
> char
> > > *buf, size_t buf
> > > if (max_valid_addr == 0)
> > > return -EOPNOTSUPP;
> > >
> > > + bufp = vzalloc(map->addr_to - map->addr_from + 4);
> > > + if (!bufp)
> > > + return -ENOMEM;
> > > +
> > > for (addr = map->addr_from; addr <= max_valid_addr; addr += 4) {
> > > ret = rtw89_mac_txpwr_read32(rtwdev, RTW89_PHY_0, addr, &val);
> > > if (ret)
> > > --
> > > 2.34.1
> >
> > Looks good to me.
>
> I suppose I can add
> Reviewed-by: Zong-Zhe Yang <kevin_yang@realtek.com>
>
> Okay?
Okay, thanks.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2] wifi: rtw89: debug: Fix memory leak in __print_txpwr_map()
2026-01-16 13:08 [PATCH v2] wifi: rtw89: debug: Fix memory leak in __print_txpwr_map() Zilin Guan
2026-01-20 3:27 ` Zong-Zhe Yang
@ 2026-01-22 2:02 ` Ping-Ke Shih
1 sibling, 0 replies; 5+ messages in thread
From: Ping-Ke Shih @ 2026-01-22 2:02 UTC (permalink / raw)
To: Zilin Guan, pkshih
Cc: kevin_yang, linux-wireless, linux-kernel, jianhao.xu, Zilin Guan
Zilin Guan <zilin@seu.edu.cn> wrote:
> In __print_txpwr_map(), memory is allocated to bufp via vzalloc().
> If max_valid_addr is 0, the function returns -EOPNOTSUPP immediately
> without freeing bufp, leading to a memory leak.
>
> Since the validation of max_valid_addr does not depend on the allocated
> memory, fix this by moving the vzalloc() call after the check.
>
> Compile tested only. Issue found using a prototype static analysis tool
> and code review.
>
> Fixes: 036042e15770 ("wifi: rtw89: debug: txpwr table supports Wi-Fi 7 chips")
> Suggested-by: Zong-Zhe Yang <kevin_yang@realtek.com>
> Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
> Reviewed-by: Zong-Zhe Yang <kevin_yang@realtek.com>
1 patch(es) applied to rtw-next branch of rtw.git, thanks.
6070a44051b1 wifi: rtw89: debug: Fix memory leak in __print_txpwr_map()
---
https://github.com/pkshih/rtw.git
^ permalink raw reply [flat|nested] 5+ messages in thread
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2026-01-16 13:08 [PATCH v2] wifi: rtw89: debug: Fix memory leak in __print_txpwr_map() Zilin Guan
2026-01-20 3:27 ` Zong-Zhe Yang
2026-01-20 3:31 ` Ping-Ke Shih
2026-01-20 3:39 ` Zong-Zhe Yang
2026-01-22 2:02 ` Ping-Ke Shih
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