Hello,

Please picked up this patch for linux 4.4 and 4.9. Compiled/tested without problem.

Thank.

[ Upstream commit 5983587c8c5ef00d6886477544ad67d495bc5479 ]

From: Colin Ian King colin.king@canonical.com Date: Fri, 22 Sep 2017 18:13:48 +0100 Subject: [PATCH] e1000: avoid null pointer dereference on invalid stat type

Currently if the stat type is invalid then data[i] is being set either by dereferencing a null pointer p, or it is reading from an incorrect previous location if we had a valid stat type previously. Fix this by skipping over the read of p on an invalid stat type.

Detected by CoverityScan, CID#113385 ("Explicit null dereferenced")

Signed-off-by: Colin Ian King colin.king@canonical.com Reviewed-by: Alexander Duyck alexander.h.duyck@intel.com Tested-by: Aaron Brown aaron.f.brown@intel.com Signed-off-by: Jeff Kirsher jeffrey.t.kirsher@intel.com --- drivers/net/ethernet/intel/e1000/e1000_ethtool.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000/e1000_ethtool.c b/drivers/net/ethernet/intel/e1000/e1000_ethtool.c index ec8aa4562cc90..3b3983a1ffbba 100644 --- a/drivers/net/ethernet/intel/e1000/e1000_ethtool.c +++ b/drivers/net/ethernet/intel/e1000/e1000_ethtool.c @@ -1824,11 +1824,12 @@ static void e1000_get_ethtool_stats(struct net_device *netdev, { struct e1000_adapter *adapter = netdev_priv(netdev); int i; - char *p = NULL; const struct e1000_stats *stat = e1000_gstrings_stats;

e1000_update_stats(adapter); - for (i = 0; i < E1000_GLOBAL_STATS_LEN; i++) { + for (i = 0; i < E1000_GLOBAL_STATS_LEN; i++, stat++) { + char *p; + switch (stat->type) { case NETDEV_STATS: p = (char *)netdev + stat->stat_offset; @@ -1839,15 +1840,13 @@ static void e1000_get_ethtool_stats(struct net_device *netdev, default: WARN_ONCE(1, "Invalid E1000 stat type: %u index %d\n", stat->type, i); - break; + continue; }

if (stat->sizeof_stat == sizeof(u64)) data[i] = *(u64 *)p; else data[i] = *(u32 *)p; - - stat++; } /* BUG_ON(i != E1000_STATS_LEN); */ }