This is a note to let you know that I've just added the patch titled
net: phy: nxp-c45-tja11xx: fix unsigned long multiplication 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:
net-phy-nxp-c45-tja11xx-fix-unsigned-long-multiplication-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.
>From bdaaecc127d471c422ee9e994978617c8aa79e1e Mon Sep 17 00:00:00 2001
From: "Radu Pirea (OSS)" <radu-nicolae.pirea@xxxxxxxxxxx>
Date: Thu, 6 Apr 2023 12:59:53 +0300
Subject: net: phy: nxp-c45-tja11xx: fix unsigned long multiplication overflow
From: Radu Pirea (OSS) <radu-nicolae.pirea@xxxxxxxxxxx>
commit bdaaecc127d471c422ee9e994978617c8aa79e1e upstream.
Any multiplication between GENMASK(31, 0) and a number bigger than 1
will be truncated because of the overflow, if the size of unsigned long
is 32 bits.
Replaced GENMASK with GENMASK_ULL to make sure that multiplication will
be between 64 bits values.
Cc: <stable@xxxxxxxxxxxxxxx> # 5.15+
Fixes: 514def5dd339 ("phy: nxp-c45-tja11xx: add timestamping support")
Signed-off-by: Radu Pirea (OSS) <radu-nicolae.pirea@xxxxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Link: https://lore.kernel.org/r/20230406095953.75622-1-radu-nicolae.pirea@xxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/phy/nxp-c45-tja11xx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/phy/nxp-c45-tja11xx.c
+++ b/drivers/net/phy/nxp-c45-tja11xx.c
@@ -168,7 +168,7 @@
#define MAX_ID_PS 2260U
#define DEFAULT_ID_PS 2000U
-#define PPM_TO_SUBNS_INC(ppb) div_u64(GENMASK(31, 0) * (ppb) * \
+#define PPM_TO_SUBNS_INC(ppb) div_u64(GENMASK_ULL(31, 0) * (ppb) * \
PTP_CLK_PERIOD_100BT1, NSEC_PER_SEC)
#define NXP_C45_SKB_CB(skb) ((struct nxp_c45_skb_cb *)(skb)->cb)
Patches currently in stable-queue which might be from radu-nicolae.pirea@xxxxxxxxxxx are
queue-5.15/net-phy-nxp-c45-tja11xx-add-remove-callback.patch
queue-5.15/net-phy-nxp-c45-tja11xx-fix-unsigned-long-multiplication-overflow.patch
