EDAC/bluefield: Fix potential integer overflow

JIRA: https://issues.redhat.com/browse/RHEL-103880
CVE: CVE-2024-53161

commit 1fe774a
Author: David Thompson <davthompson@nvidia.com>
Date:   Mon Sep 30 11:10:56 2024 -0400

    EDAC/bluefield: Fix potential integer overflow

    The 64-bit argument for the "get DIMM info" SMC call consists of mem_ctrl_idx
    left-shifted 16 bits and OR-ed with DIMM index.  With mem_ctrl_idx defined as
    32-bits wide the left-shift operation truncates the upper 16 bits of
    information during the calculation of the SMC argument.

    The mem_ctrl_idx stack variable must be defined as 64-bits wide to prevent any
    potential integer overflow, i.e. loss of data from upper 16 bits.

    Fixes: 82413e5 ("EDAC, mellanox: Add ECC support for BlueField DDR4")
    Signed-off-by: David Thompson <davthompson@nvidia.com>
    Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
    Reviewed-by: Shravan Kumar Ramani <shravankr@nvidia.com>
    Link: https://lore.kernel.org/r/20240930151056.10158-1-davthompson@nvidia.com

Signed-off-by: Jennifer Berringer <jberring@redhat.com>

Author: Jennifer Berringer

drivers/edac/bluefield_edac.c

@@ -180,7 +180,7 @@ static void bluefield_edac_check(struct mem_ctl_info *mci)
 static void bluefield_edac_init_dimms(struct mem_ctl_info *mci)
 {
 	struct bluefield_edac_priv *priv = mci->pvt_info;
-	int mem_ctrl_idx = mci->mc_idx;
+	u64 mem_ctrl_idx = mci->mc_idx;
 	struct dimm_info *dimm;
 	u64 smc_info, smc_arg;
 	int is_empty = 1, i;