libertas: Avoid reading past end of buffer

Using memcpy() from a string that is shorter than the length copied means
the destination buffer is being filled with arbitrary data from the kernel
rodata segment. Instead, redefine the stat strings to be ETH_GSTRING_LEN
sizes, like other drivers. This lets us use a single memcpy that does not
leak rodata contents. Additionally adjust indentation to keep checkpatch.pl
happy.

This was found with the future CONFIG_FORTIFY_SOURCE feature.

Cc: Daniel Micay <danielmicay@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/marvell/libertas/mesh.c b/drivers/net/wireless/marvell/libertas/mesh.c
index d0c881dd584677f18c551657d351b6bee435da5f..2229fb4481895d26bb911291092953c463c3122a 100644 (file)
--- a/drivers/net/wireless/marvell/libertas/mesh.c
+++ b/drivers/net/wireless/marvell/libertas/mesh.c
@@ -1108,15 +1108,15 @@ void lbs_mesh_set_txpd(struct lbs_private *priv,
  * Ethtool related
  */
 
-static const char * const mesh_stat_strings[] = {
-                       "drop_duplicate_bcast",
-                       "drop_ttl_zero",
-                       "drop_no_fwd_route",
-                       "drop_no_buffers",
-                       "fwded_unicast_cnt",
-                       "fwded_bcast_cnt",
-                       "drop_blind_table",
-                       "tx_failed_cnt"
+static const char mesh_stat_strings[MESH_STATS_NUM][ETH_GSTRING_LEN] = {
+       "drop_duplicate_bcast",
+       "drop_ttl_zero",
+       "drop_no_fwd_route",
+       "drop_no_buffers",
+       "fwded_unicast_cnt",
+       "fwded_bcast_cnt",
+       "drop_blind_table",
+       "tx_failed_cnt"
 };
 
 void lbs_mesh_ethtool_get_stats(struct net_device *dev,
@@ -1170,17 +1170,11 @@ int lbs_mesh_ethtool_get_sset_count(struct net_device *dev, int sset)
 void lbs_mesh_ethtool_get_strings(struct net_device *dev,
        uint32_t stringset, uint8_t *s)
 {
-       int i;
-
        lbs_deb_enter(LBS_DEB_ETHTOOL);
 
        switch (stringset) {
        case ETH_SS_STATS:
-               for (i = 0; i < MESH_STATS_NUM; i++) {
-                       memcpy(s + i * ETH_GSTRING_LEN,
-                                       mesh_stat_strings[i],
-                                       ETH_GSTRING_LEN);
-               }
+               memcpy(s, mesh_stat_strings, sizeof(mesh_stat_strings));
                break;
        }
        lbs_deb_enter(LBS_DEB_ETHTOOL);