[PATCH 6.19 353/781] wifi: rtw89: debug: Fix memory leak in __print_txpwr_map()

Greg Kroah-Hartman
2026-02-25T01:34:14Z

From: Zilin Guan <zilin@seu.edu.cn>

[ Upstream commit 6070a44051b1c35714fa130de7726cfe91ca5559 ]

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>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260116130834.1413924-1-zilin@seu.edu.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 1264c2f82600b..987eef8170f2b 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)
--
2.51.0