This is a note to let you know that I've just added the patch titled
EDAC/bluefield: Fix potential integer overflow
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
edac-bluefield-fix-potential-integer-overflow.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3868a91a65b170438c982a2e4752a8889418acef
Author: David Thompson <davthompson@xxxxxxxxxx>
Date: Mon Sep 30 11:10:56 2024 -0400
EDAC/bluefield: Fix potential integer overflow
[ 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>
diff --git a/drivers/edac/bluefield_edac.c b/drivers/edac/bluefield_edac.c
index e4736eb37bfb3..0ef0489827682 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;
