linux-hardening - Re: Coverity: rtw89_mac_resize_ple_rx

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Date:   Thu, 03 Nov 2022 08:03:59 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     Ping-Ke Shih <pkshih@...ltek.com>
Cc:     coverity-bot <keescook@...omium.org>,
        Gary Chang <gary.chang@...ltek.com>,
        Timlee <timlee@...ltek.com>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "linux-next\@vger.kernel.org" <linux-next@...r.kernel.org>,
        "linux-hardening\@vger.kernel.org" <linux-hardening@...r.kernel.org>,
        linux-wireless@...r.kernel.org
Subject: Re: Coverity: rtw89_mac_resize_ple_rx_quota(): Integer handling issues

Ping-Ke Shih <pkshih@...ltek.com> writes:

>> -----Original Message-----
>> From: coverity-bot <keescook@...omium.org>
>> Sent: Thursday, November 3, 2022 3:53 AM
>> To: Gary Chang <gary.chang@...ltek.com>
>> Cc: Timlee <timlee@...ltek.com>; Kalle Valo <kvalo@...nel.org>; Ping-Ke Shih <pkshih@...ltek.com>; Gustavo
>> A. R. Silva <gustavo@...eddedor.com>; linux-next@...r.kernel.org; linux-hardening@...r.kernel.org
>> Subject: Coverity: rtw89_mac_resize_ple_rx_quota(): Integer handling issues
>> 
>> Hello!
>> 
>> This is an experimental semi-automated report about issues detected by
>> Coverity from a scan of next-20221102 as part of the linux-next scan project:
>> https://scan.coverity.com/projects/linux-next-weekly-scan
>> 
>> You're getting this email because you were associated with the identified
>> lines of code (noted below) that were touched by commits:
>> 
>>   Tue Nov 1 11:26:13 2022 +0200
>>     7a68ec3da79e ("wifi: rtw89: add function to adjust and restore PLE quota")
>> 
>> Coverity reported the following:
>> 
>> *** CID 1527095:  Integer handling issues  (SIGN_EXTENSION)
>> /drivers/net/wireless/realtek/rtw89/mac.c: 1562 in rtw89_mac_resize_ple_rx_quota()
>> 1556     		rtw89_err(rtwdev, "[ERR]get_dle_mem_cfg\n");
>> 1557     		return -EINVAL;
>> 1558     	}
>> 1559
>> 1560     	min_cfg = cfg->ple_min_qt;
>> 1561     	max_cfg = cfg->ple_max_qt;
>> vvv     CID 1527095:  Integer handling issues  (SIGN_EXTENSION)
>> vvv     Suspicious implicit sign extension: "max_cfg->cma0_dma" with type "u16" (16 bits, unsigned) is
>> promoted in "max_cfg->cma0_dma << 16" to type "int" (32 bits, signed), then sign-extended to type "unsigned
>> long" (64 bits, unsigned).  If "max_cfg->cma0_dma << 16" is greater than 0x7FFFFFFF, the upper bits of the
>> result will all be 1.
>
> Thanks for pointing this. I'll fix it.

Thanks Ping.

I noticed that linux-wireless list was missing in CC, would it possible
for the bot to automatically add that to all wireless related reports?
Adding it manually now.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

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