6.12-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
