linux-hardening - Coverity: rtw89_mac_resize_ple_rx

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Date:   Wed, 2 Nov 2022 12:53:26 -0700
From:   coverity-bot <keescook@...omium.org>
To:     Chih-Kang Chang <gary.chang@...ltek.com>
Cc:     Chin-Yen Lee <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.
1562     	SET_QUOTA(cma0_dma, PLE, 6);
1563     	SET_QUOTA(cma1_dma, PLE, 7);
1564
1565     	return 0;
1566     }
1567     #undef SET_QUOTA

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):

Reported-by: coverity-bot <keescook+coverity-bot@...omium.org>
Addresses-Coverity-ID: 1527095 ("Integer handling issues")
Fixes: 7a68ec3da79e ("wifi: rtw89: add function to adjust and restore PLE quota")

Thanks for your attention!

-- 
Coverity-bot