linux-kernel - [PATCH] net: wireless: cisco: Fix possible uninit bug

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Message-ID: <CA+UBctBLWF14TsgT4OfanmnxTqbm9mNxyHhjJqpFo7c+kdjDsw@mail.gmail.com>
Date:   Tue, 4 Jul 2023 16:50:45 -0700
From:   Yu Hao <yhao016@....edu>
To:     kvalo@...nel.org, keescook@...omium.org, gustavoars@...nel.org,
        Jason@...c4.com, linux-wireless@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] net: wireless: cisco: Fix possible uninit bug

The struct cap_rid should be initialized by function readCapabilityRid.
However, there is not return value check. Iit is possible that
the function readCapabilityRid returns error code and cap_rid.softCap
is not initialized. But there is a read later for this field.

Signed-off-by: Yu Hao <yhao016@....edu>
---
 drivers/net/wireless/cisco/airo.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/cisco/airo.c
b/drivers/net/wireless/cisco/airo.c
index 7c4cc5f5e1eb..b3736d76a5d5 100644
--- a/drivers/net/wireless/cisco/airo.c
+++ b/drivers/net/wireless/cisco/airo.c
@@ -6950,8 +6950,11 @@ static int airo_get_range(struct net_device *dev,
    CapabilityRid cap_rid;      /* Card capability info */
    int     i;
    int     k;
+   int     status;

-   readCapabilityRid(local, &cap_rid, 1);
+   status = readCapabilityRid(local, &cap_rid, 1);
+   if (status != SUCCESS)
+       return ERROR;

    dwrq->length = sizeof(struct iw_range);
    memset(range, 0, sizeof(*range));
-- 
2.34.1