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Fri, 08 Nov 2024 08:40:47 -0800 (PST) Received: from Emma ([2401:4900:1c94:8072:5054:ff:fe53:2787]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-72407a56a4asm3993154b3a.187.2024.11.08.08.40.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Nov 2024 08:40:46 -0800 (PST) From: Karan Sanghavi Date: Fri, 08 Nov 2024 16:40:41 +0000 Subject: [PATCH v2] RAS/AMD/ATL: Fix unintended sign extension issue from coverity Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241108-coverity1593397signextension-v2-1-4acdf3968d2d@gmail.com> X-B4-Tracking: v=1; b=H4sIAAg/LmcC/42NQQ6CMBBFr0JmbQ1TWhFX3sOwwDLAJNKaljQQ0 rtbOIHL95P3/g6BPFOAR7GDp8iBnc0gLwWYqbMjCe4zgyylQiyVMC5mY9lQN1XV1IFHS+tC9hB FfTfNWxqJvUbIia+ngdcz/2ozTxwW57fzLeKx/hmOKFAoM3R005VEVT7HuePP1bgZ2pTSDzn70 erIAAAA To: Yazen Ghannam , Tony Luck , Borislav Petkov Cc: linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, Shuah Khan , Karan Sanghavi X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1731084043; l=1751; i=karansanghvi98@gmail.com; s=20241017; h=from:subject:message-id; bh=XstB/DxOJh0mY+nZ9Wa3sD7MLYUdmMNRWMK97jb7eO8=; b=24Sz8zuhuUFhBvLvAlwgL9dnrayB/T8hZgUa1UnfNG7UcAMVUpfEbGETBAo3NuUDW7UAAiVhC mWUrI9qbW/pBYWqfFJz9mnh24LJxJ8gDAHmLO7EIhm80xQMoDFK8E/F X-Developer-Key: i=karansanghvi98@gmail.com; a=ed25519; pk=UAcbefT1C06npNVDJHdgpPqTm4WE9IhaA1fmJb3A37Y= This error is reported by coverity scan stating as CID 1593397: (#1 of 1): Unintended sign extension (SIGN_EXTENSION) sign_extension: Suspicious implicit sign extension: pc with type u16 (16 bits, unsigned) is promoted in pc << bit_shifts.pc to type int (32 bits, signed), then sign-extended to type unsigned long (64 bits, unsigned). If pc << bit_shifts.pc is greater than 0x7FFFFFFF, the upper bits of the result will all be 1. Following the code styleof the file, assigning the u16 value to u32 variable and using it for the bit wise operation, thus ensuring no unintentional sign extension occurs. Signed-off-by: Karan Sanghavi Reviewed-by: Yazen Ghannam --- Coverity Link:=20 https://scan7.scan.coverity.com/#/project-view/51975/11354?selectedIssue=3D= 1593397 --- Changes in v2: - Assigning pc value to temp variable before left shifting as mentioned in feedback rather then typecasting pc to u32.=20 - Link to v1: https://lore.kernel.org/r/20241104-coverity1593397signextensi= on-v1-1-4cfae6532140@gmail.com --- drivers/ras/amd/atl/umc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/ras/amd/atl/umc.c b/drivers/ras/amd/atl/umc.c index dc8aa12f63c8..3f4b1f31e14f 100644 --- a/drivers/ras/amd/atl/umc.c +++ b/drivers/ras/amd/atl/umc.c @@ -293,7 +293,8 @@ static unsigned long convert_dram_to_norm_addr_mi300(un= signed long addr) } =20 /* PC bit */ - addr |=3D pc << bit_shifts.pc; + temp =3D pc; + addr |=3D temp << bit_shifts.pc; =20 /* SID bits */ for (i =3D 0; i < NUM_SID_BITS; i++) { --- base-commit: 81983758430957d9a5cb3333fe324fd70cf63e7e change-id: 20241104-coverity1593397signextension-78c9b2c21d51 Best regards, --=20 Karan Sanghavi