From: Radu Pirea (OSS) Date: Thu, 6 Apr 2023 09:59:53 +0000 (+0300) Subject: net: phy: nxp-c45-tja11xx: fix unsigned long multiplication overflow X-Git-Tag: v6.1.37~2172 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c918d0bc687c0e020dfc8f3673b08ac57174f73a;p=platform%2Fkernel%2Flinux-starfive.git net: phy: nxp-c45-tja11xx: fix unsigned long multiplication overflow 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: # 5.15+ Fixes: 514def5dd339 ("phy: nxp-c45-tja11xx: add timestamping support") Signed-off-by: Radu Pirea (OSS) Reviewed-by: Andrew Lunn Link: https://lore.kernel.org/r/20230406095953.75622-1-radu-nicolae.pirea@oss.nxp.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/phy/nxp-c45-tja11xx.c b/drivers/net/phy/nxp-c45-tja11xx.c index 27738d1ae9ea..029875a59ff8 100644 --- a/drivers/net/phy/nxp-c45-tja11xx.c +++ b/drivers/net/phy/nxp-c45-tja11xx.c @@ -191,7 +191,7 @@ #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)