From 103040a94970a52dde285a24f0fbb5193ea74d84 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jarom=C3=ADr=20Kon=C4=8Dick=C3=BD?= <jkoncick@redhat.com>
Date: Tue, 15 Oct 2013 21:55:52 +0200
Subject: [PATCH] fix potential buffer overflows reported by static analysis

(cherry picked from commit 8f586939999e039563fee6bca4685895067a2b77)
Signed-off-by: Phil Sutter <psutter@redhat.com>
---
 arptables.c              |  9 +++++----
 libarptc/libarptc_incl.c | 16 ++++++++++------
 2 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/arptables.c b/arptables.c
index 8ef445a4700c4..4da6fea980bb9 100644
--- a/arptables.c
+++ b/arptables.c
@@ -1270,7 +1270,7 @@ print_firewall(const struct arpt_entry *fw,
 			sprintf(buf, "%s", addr_to_dotted(&(fw->arp.src)));
 		else
 			sprintf(buf, "%s", addr_to_anyname(&(fw->arp.src)));
-		strcat(buf, mask_to_dotted(&(fw->arp.smsk)));
+		strncat(buf, mask_to_dotted(&(fw->arp.smsk)), sizeof(buf) - strlen(buf) -1);
 		printf("-s %s ", buf);
 	}
 
@@ -1294,7 +1294,7 @@ after_devsrc:
 			sprintf(buf, "%s", addr_to_dotted(&(fw->arp.tgt)));
 		else
 			sprintf(buf, "%s", addr_to_anyname(&(fw->arp.tgt)));
-		strcat(buf, mask_to_dotted(&(fw->arp.tmsk)));
+		strncat(buf, mask_to_dotted(&(fw->arp.tmsk)),  sizeof(buf) - strlen(buf) -1);
 		printf("-d %s ", buf);
 	}
 
@@ -1796,7 +1796,7 @@ int do_command(int argc, char *argv[], char **table, arptc_handle_t *handle)
 				*table, arptc_strerror(errno));
 			}
 		}
-        }
+	}
 
 	memset(&fw, 0, sizeof(fw));
 	opts = original_opts;
@@ -2064,7 +2064,8 @@ int do_command(int argc, char *argv[], char **table, arptc_handle_t *handle)
 
 				target->t = fw_calloc(1, size);
 				target->t->u.target_size = size;
-				strcpy(target->t->u.user.name, jumpto);
+				strncpy(target->t->u.user.name, jumpto, sizeof(target->t->u.user.name));
+				target->t->u.user.name[sizeof(target->t->u.user.name)-1] = '\0';
 /*
 				target->init(target->t, &fw.nfcache);
 */
diff --git a/libarptc/libarptc_incl.c b/libarptc/libarptc_incl.c
index 2fa3d43576933..9c1aeac7ca3de 100644
--- a/libarptc/libarptc_incl.c
+++ b/libarptc/libarptc_incl.c
@@ -209,8 +209,10 @@ alloc_handle(const char *tablename, unsigned int size, unsigned int num_rules)
 	h->counter_map = (void *)h
 		+ sizeof(STRUCT_TC_HANDLE)
 		+ size;
-	strcpy(h->info.name, tablename);
-	strcpy(h->entries.name, tablename);
+	strncpy(h->info.name, tablename, sizeof(h->info.name));
+	h->info.name[sizeof(h->info.name)-1] = '\0';
+	strncpy(h->entries.name, tablename, sizeof(h->entries.name));
+	h->entries.name[sizeof(h->entries.name)-1] = '\0';
 
 	return h;
 }
@@ -357,8 +359,9 @@ add_chain(STRUCT_ENTRY *e, TC_HANDLE_T h, STRUCT_ENTRY **prev)
 		h->cache_chain_heads[h->cache_num_chains-1].end
 			= *prev;
 
-		strcpy(h->cache_chain_heads[h->cache_num_chains].name,
-		       (const char *)GET_TARGET(e)->data);
+		strncpy(h->cache_chain_heads[h->cache_num_chains].name,
+		       (const char *)GET_TARGET(e)->data, TABLE_MAXNAMELEN-1);
+		h->cache_chain_heads[h->cache_num_chains].name[TABLE_MAXNAMELEN-1] = '\0';
 		h->cache_chain_heads[h->cache_num_chains].start
 			= (void *)e + e->next_offset;
 		h->cache_num_chains++;
@@ -368,8 +371,9 @@ add_chain(STRUCT_ENTRY *e, TC_HANDLE_T h, STRUCT_ENTRY **prev)
 			h->cache_chain_heads[h->cache_num_chains-1].end
 				= *prev;
 
-		strcpy(h->cache_chain_heads[h->cache_num_chains].name,
-		       h->hooknames[builtin-1]);
+		strncpy(h->cache_chain_heads[h->cache_num_chains].name,
+		       h->hooknames[builtin-1], TABLE_MAXNAMELEN-1);
+		h->cache_chain_heads[h->cache_num_chains].name[TABLE_MAXNAMELEN-1] = '\0';
 		h->cache_chain_heads[h->cache_num_chains].start
 			= (void *)e;
 		h->cache_num_chains++;
-- 
2.21.0