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authorColin Ian King <colin.king@canonical.com>2018-02-16 16:55:05 +0000
committerDavid S. Miller <davem@davemloft.net>2018-02-16 16:36:03 -0500
commitb2d12101bff95c27960c69f3e54a98afdc205bb3 (patch)
tree926aa48600bf8319af1fe4f2c9511ddcfda00910 /drivers/net/dsa
parent75efa06f457bbed3931bf693b7137cf4da3b5c80 (diff)
downloadlinux-b2d12101bff95c27960c69f3e54a98afdc205bb3.tar.gz
net: dsa: mv88e6xxx: avoid unintended sign extension on a 16 bit shift
The shifting of timehi by 16 bits to the left will be promoted to a 32 bit signed int and then sign-extended to an u64. If the top bit of timehi is set then all then all the upper bits of ns end up as also being set because of the sign-extension. Fix this by making timehi and timelo u64. Also move the declaration of ns. Detected by CoverityScan, CID#1465288 ("Unintended sign extension") Fixes: c6fe0ad2c349 ("net: dsa: mv88e6xxx: add rx/tx timestamping support") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/dsa')
-rw-r--r--drivers/net/dsa/mv88e6xxx/hwtstamp.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/net/dsa/mv88e6xxx/hwtstamp.c b/drivers/net/dsa/mv88e6xxx/hwtstamp.c
index b251d534b70d..2149d332dea0 100644
--- a/drivers/net/dsa/mv88e6xxx/hwtstamp.c
+++ b/drivers/net/dsa/mv88e6xxx/hwtstamp.c
@@ -293,7 +293,8 @@ static void mv88e6xxx_get_rxts(struct mv88e6xxx_chip *chip,
struct sk_buff *skb, u16 reg,
struct sk_buff_head *rxq)
{
- u16 buf[4] = { 0 }, status, timelo, timehi, seq_id;
+ u16 buf[4] = { 0 }, status, seq_id;
+ u64 ns, timelo, timehi;
struct skb_shared_hwtstamps *shwt;
int err;
@@ -321,7 +322,7 @@ static void mv88e6xxx_get_rxts(struct mv88e6xxx_chip *chip,
*/
for ( ; skb; skb = skb_dequeue(rxq)) {
if (mv88e6xxx_ts_valid(status) && seq_match(skb, seq_id)) {
- u64 ns = timehi << 16 | timelo;
+ ns = timehi << 16 | timelo;
mutex_lock(&chip->reg_lock);
ns = timecounter_cyc2time(&chip->tstamp_tc, ns);