linux-hardening - Coverity: genphy_c45_plca_set

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Date:   Fri, 13 Jan 2023 15:41:49 -0800
From:   coverity-bot <keescook@...omium.org>
To:     Piergiorgio Beruto <piergiorgio.beruto@...il.com>
Cc:     Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        netdev@...r.kernel.org, Heiner Kallweit <hkallweit1@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Andrew Lunn <andrew@...n.ch>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-next@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Coverity: genphy_c45_plca_set_cfg(): UNINIT

Hello!

This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20230113 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:

  Wed Jan 11 08:35:02 2023 +0000
    493323416fed ("drivers/net/phy: add helpers to get/set PLCA configuration")

Coverity reported the following:

*** CID 1530573:    (UNINIT)
drivers/net/phy/phy-c45.c:1036 in genphy_c45_plca_set_cfg()
1030     				return ret;
1031
1032     			val = ret;
1033     		}
1034
1035     		if (plca_cfg->node_cnt >= 0)
vvv     CID 1530573:    (UNINIT)
vvv     Using uninitialized value "val".
1036     			val = (val & ~MDIO_OATC14_PLCA_NCNT) |
1037     			      (plca_cfg->node_cnt << 8);
1038
1039     		if (plca_cfg->node_id >= 0)
1040     			val = (val & ~MDIO_OATC14_PLCA_ID) |
1041     			      (plca_cfg->node_id);
drivers/net/phy/phy-c45.c:1076 in genphy_c45_plca_set_cfg()
1070     				return ret;
1071
1072     			val = ret;
1073     		}
1074
1075     		if (plca_cfg->burst_cnt >= 0)
vvv     CID 1530573:    (UNINIT)
vvv     Using uninitialized value "val".
1076     			val = (val & ~MDIO_OATC14_PLCA_MAXBC) |
1077     			      (plca_cfg->burst_cnt << 8);
1078
1079     		if (plca_cfg->burst_tmr >= 0)
1080     			val = (val & ~MDIO_OATC14_PLCA_BTMR) |
1081     			      (plca_cfg->burst_tmr);

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: 1530573 ("UNINIT")
Fixes: 493323416fed ("drivers/net/phy: add helpers to get/set PLCA configuration")

Thanks for your attention!

-- 
Coverity-bot