6.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: David Thompson <davthompson@xxxxxxxxxx> [ Upstream commit 1fe774a93b46bb029b8f6fa9d1f25affa53f06c6 ] 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: 82413e562ea6 ("EDAC, mellanox: Add ECC support for BlueField DDR4") Signed-off-by: David Thompson <davthompson@xxxxxxxxxx> Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx> Reviewed-by: Shravan Kumar Ramani <shravankr@xxxxxxxxxx> Link: https://lore.kernel.org/r/20240930151056.10158-1-davthompson@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/edac/bluefield_edac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/edac/bluefield_edac.c b/drivers/edac/bluefield_edac.c index 5b3164560648e..0e539c1073510 100644 --- a/drivers/edac/bluefield_edac.c +++ b/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; -- 2.43.0