linux-kernel - [PATCH] perf/x86/intel/uncore: fix integer overflow on shift of a u32 integer

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Date:   Wed,  2 Oct 2019 12:55:45 +0100
From:   Colin King <colin.king@...onical.com>
To:     Kan Liang <kan.liang@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] perf/x86/intel/uncore: fix integer overflow on shift of a u32 integer

From: Colin Ian King <colin.king@...onical.com>

Shifting the u32 integer result of (pci_dword & SNR_IMC_MMIO_BASE_MASK)
will end up with an overflow when pci_dword greater than 0x1ff. Fix this
by casting pci_dword to a resource_size_t before masking and shifting it.

Addresses-Coverity: ("Unintentional integer overflow")
Fixes: ee49532b38dd ("perf/x86/intel/uncore: Add IMC uncore support for Snow Ridge")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 arch/x86/events/intel/uncore_snbep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index b10a5ec79e48..ed69df1340d9 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -4415,7 +4415,7 @@ static void snr_uncore_mmio_init_box(struct intel_uncore_box *box)
 		return;
 
 	pci_read_config_dword(pdev, SNR_IMC_MMIO_BASE_OFFSET, &pci_dword);
-	addr = (pci_dword & SNR_IMC_MMIO_BASE_MASK) << 23;
+	addr = ((resource_size_t)pci_dword & SNR_IMC_MMIO_BASE_MASK) << 23;
 
 	pci_read_config_dword(pdev, SNR_IMC_MMIO_MEM0_OFFSET, &pci_dword);
 	addr |= (pci_dword & SNR_IMC_MMIO_MEM0_MASK) << 12;
-- 
2.20.1