linux-hardening - RE: Coverity: rtw89_mac_resize_ple_rx

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Date:   Thu, 3 Nov 2022 01:26:45 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     coverity-bot <keescook@...omium.org>,
        Gary Chang <gary.chang@...ltek.com>
CC:     Timlee <timlee@...ltek.com>, Kalle Valo <kvalo@...nel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: RE: Coverity: rtw89_mac_resize_ple_rx_quota(): Integer handling issues


> -----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.

Ping-Ke

> 1562     	SET_QUOTA(cma0_dma, PLE, 6);
> 1563     	SET_QUOTA(cma1_dma, PLE, 7);
> 1564
> 1565     	return 0;
> 1566     }
> 1567     #undef SET_QUOTA
>