[AX25]: Make ax2asc thread-proof

Ax2asc was still using a static buffer for all invocations which isn't
exactly SMP-safe.  Change ax2asc to take an additional result buffer as
the argument.  Change all callers to provide such a buffer.

Signed-off-by: Ralf Baechle DL5RB <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

10 files changed, 39 insertions, 24 deletions

diff --git a/include/net/ax25.h b/include/net/ax25.h
index 926eed543023..364b046e9f47 100644
--- a/include/net/ax25.h
+++ b/include/net/ax25.h
@@ -257,7 +257,7 @@ extern struct sock *ax25_make_new(struct sock *, struct ax25_dev *);
 
 /* ax25_addr.c */
 extern ax25_address null_ax25_address;
-extern char *ax2asc(ax25_address *);
+extern char *ax2asc(char *buf, ax25_address *);
 extern ax25_address *asc2ax(char *);
 extern int  ax25cmp(ax25_address *, ax25_address *);
 extern int  ax25digicmp(ax25_digi *, ax25_digi *);
diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index ea43dfb774e2..ed705ddad56b 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1874,6 +1874,7 @@ static void ax25_info_stop(struct seq_file *seq, void *v)
 static int ax25_info_show(struct seq_file *seq, void *v)
 {
         ax25_cb *ax25 = v;
+        char buf[11];
         int k;
 
 
@@ -1885,13 +1886,13 @@ static int ax25_info_show(struct seq_file *seq, void *v)
         seq_printf(seq, "%8.8lx %s %s%s ",
                    (long) ax25,
                    ax25->ax25_dev == NULL? "???" : ax25->ax25_dev->dev->name,
-                   ax2asc(&ax25->source_addr),
+                   ax2asc(buf, &ax25->source_addr),
                    ax25->iamdigi? "*":"");
-        seq_printf(seq, "%s", ax2asc(&ax25->dest_addr));
+        seq_printf(seq, "%s", ax2asc(buf, &ax25->dest_addr));
 
         for (k=0; (ax25->digipeat != NULL) && (k < ax25->digipeat->ndigi); k++) {
                 seq_printf(seq, ",%s%s",
-                           ax2asc(&ax25->digipeat->calls[k]),
+                           ax2asc(buf, &ax25->digipeat->calls[k]),
                            ax25->digipeat->repeated[k]? "*":"");
         }
 
diff --git a/net/ax25/ax25_addr.c b/net/ax25/ax25_addr.c
index f4fa6dfb846e..dca179daf415 100644
--- a/net/ax25/ax25_addr.c
+++ b/net/ax25/ax25_addr.c
@@ -36,9 +36,8 @@ ax25_address null_ax25_address = {{0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x00}};
 /*
  *      ax25 -> ascii conversion
  */
-char *ax2asc(ax25_address *a)
+char *ax2asc(char *buf, ax25_address *a)
 {
-        static char buf[11];
         char c, *s;
         int n;
 
diff --git a/net/ax25/ax25_route.c b/net/ax25/ax25_route.c
index c288526da4ce..26b77d972220 100644
--- a/net/ax25/ax25_route.c
+++ b/net/ax25/ax25_route.c
@@ -298,6 +298,8 @@ static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
 
 static int ax25_rt_seq_show(struct seq_file *seq, void *v)
 {
+        char buf[11];
+
         if (v == SEQ_START_TOKEN)
                 seq_puts(seq, "callsign  dev  mode digipeaters\n");
         else {
@@ -308,7 +310,7 @@ static int ax25_rt_seq_show(struct seq_file *seq, void *v)
                 if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
                         callsign = "default";
                 else
-                        callsign = ax2asc(&ax25_rt->callsign);
+                        callsign = ax2asc(buf, &ax25_rt->callsign);
 
                 seq_printf(seq, "%-9s %-4s",
                         callsign,
@@ -328,7 +330,8 @@ static int ax25_rt_seq_show(struct seq_file *seq, void *v)
 
                 if (ax25_rt->digipeat != NULL)
                         for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
-                                seq_printf(seq, " %s", ax2asc(&ax25_rt->digipeat->calls[i]));
+                                seq_printf(seq, " %s",
+                                     ax2asc(buf, &ax25_rt->digipeat->calls[i]));
 
                 seq_puts(seq, "\n");
         }
diff --git a/net/ax25/ax25_uid.c b/net/ax25/ax25_uid.c
index a8b3822f3ee4..d53cc8615865 100644
--- a/net/ax25/ax25_uid.c
+++ b/net/ax25/ax25_uid.c
@@ -168,12 +168,14 @@ static void ax25_uid_seq_stop(struct seq_file *seq, void *v)
 
 static int ax25_uid_seq_show(struct seq_file *seq, void *v)
 {
+        char buf[11];
+
         if (v == SEQ_START_TOKEN)
                 seq_printf(seq, "Policy: %d\n", ax25_uid_policy);
         else {
                 struct ax25_uid_assoc *pt = v;
 
-                seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(&pt->call));
+                seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call));
         }
         return 0;
 }
diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index 4b53de982114..f4578c759ffc 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -1261,6 +1261,7 @@ static int nr_info_show(struct seq_file *seq, void *v)
         struct net_device *dev;
         struct nr_sock *nr;
         const char *devname;
+        char buf[11];
 
         if (v == SEQ_START_TOKEN)
                 seq_puts(seq,
@@ -1276,11 +1277,11 @@ static int nr_info_show(struct seq_file *seq, void *v)
                 else
                         devname = dev->name;
 
-                seq_printf(seq, "%-9s ", ax2asc(&nr->user_addr));
-                seq_printf(seq, "%-9s ", ax2asc(&nr->dest_addr));
+                seq_printf(seq, "%-9s ", ax2asc(buf, &nr->user_addr));
+                seq_printf(seq, "%-9s ", ax2asc(buf, &nr->dest_addr));
                 seq_printf(seq, 
 "%-9s %-3s  %02X/%02X %02X/%02X %2d %3d %3d %3d %3lu/%03lu %2lu/%02lu %3lu/%03lu %3lu/%03lu %2d/%02d %3d %5d %5d %ld\n",
-                        ax2asc(&nr->source_addr),
+                        ax2asc(buf, &nr->source_addr),
                         devname,
                         nr->my_index,
                         nr->my_id,
diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c
index 7a86b36cba50..b3b9097c87c7 100644
--- a/net/netrom/nr_route.c
+++ b/net/netrom/nr_route.c
@@ -881,6 +881,7 @@ static void nr_node_stop(struct seq_file *seq, void *v)
 
 static int nr_node_show(struct seq_file *seq, void *v)
 {
+        char buf[11];
         int i;
 
         if (v == SEQ_START_TOKEN)
@@ -890,7 +891,7 @@ static int nr_node_show(struct seq_file *seq, void *v)
                 struct nr_node *nr_node = v;
                 nr_node_lock(nr_node);
                 seq_printf(seq, "%-9s %-7s  %d %d",
-                        ax2asc(&nr_node->callsign),
+                        ax2asc(buf, &nr_node->callsign),
                         (nr_node->mnemonic[0] == '\0') ? "*" : nr_node->mnemonic,
                         nr_node->which + 1,
                         nr_node->count);
@@ -964,6 +965,7 @@ static void nr_neigh_stop(struct seq_file *seq, void *v)
 
 static int nr_neigh_show(struct seq_file *seq, void *v)
 {
+        char buf[11];
         int i;
 
         if (v == SEQ_START_TOKEN)
@@ -973,7 +975,7 @@ static int nr_neigh_show(struct seq_file *seq, void *v)
 
                 seq_printf(seq, "%05d %-9s %-4s  %3d    %d   %3d    %3d",
                         nr_neigh->number,
-                        ax2asc(&nr_neigh->callsign),
+                        ax2asc(buf, &nr_neigh->callsign),
                         nr_neigh->dev ? nr_neigh->dev->name : "???",
                         nr_neigh->quality,
                         nr_neigh->locked,
@@ -983,7 +985,7 @@ static int nr_neigh_show(struct seq_file *seq, void *v)
                 if (nr_neigh->digipeat != NULL) {
                         for (i = 0; i < nr_neigh->digipeat->ndigi; i++)
                                 seq_printf(seq, " %s", 
-                                           ax2asc(&nr_neigh->digipeat->calls[i]));
+                                           ax2asc(buf, &nr_neigh->digipeat->calls[i]));
                 }
 
                 seq_puts(seq, "\n");
diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index c6e59f84c3ae..3077878ed4f0 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -1363,6 +1363,8 @@ static void rose_info_stop(struct seq_file *seq, void *v)
 
 static int rose_info_show(struct seq_file *seq, void *v)
 {
+        char buf[11];
+
         if (v == SEQ_START_TOKEN)
                 seq_puts(seq, 
                          "dest_addr  dest_call src_addr   src_call  dev   lci neigh st vs vr va   t  t1  t2  t3  hb    idle Snd-Q Rcv-Q inode\n");
@@ -1380,12 +1382,12 @@ static int rose_info_show(struct seq_file *seq, void *v)
                 
                 seq_printf(seq, "%-10s %-9s ",
                         rose2asc(&rose->dest_addr),
-                        ax2asc(&rose->dest_call));
+                        ax2asc(buf, &rose->dest_call));
 
                 if (ax25cmp(&rose->source_call, &null_ax25_address) == 0)
                         callsign = "??????-?";
                 else
-                        callsign = ax2asc(&rose->source_call);
+                        callsign = ax2asc(buf, &rose->source_call);
 
                 seq_printf(seq,
                            "%-10s %-9s %-5s %3.3X %05d  %d  %d  %d  %d %3lu %3lu %3lu %3lu %3lu %3lu/%03lu %5d %5d %ld\n",
diff --git a/net/rose/rose_route.c b/net/rose/rose_route.c
index 4510cd7613ec..e556d92c0bc4 100644
--- a/net/rose/rose_route.c
+++ b/net/rose/rose_route.c
@@ -851,6 +851,7 @@ int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
         unsigned char cause, diagnostic;
         struct net_device *dev;
         int len, res = 0;
+        char buf[11];
 
 #if 0
         if (call_in_firewall(PF_ROSE, skb->dev, skb->data, NULL, &skb) != FW_ACCEPT)
@@ -876,7 +877,7 @@ int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25)
 
         if (rose_neigh == NULL) {
                 printk("rose_route : unknown neighbour or device %s\n",
-                       ax2asc(&ax25->dest_addr));
+                       ax2asc(buf, &ax25->dest_addr));
                 goto out;
         }
 
@@ -1178,6 +1179,7 @@ static void rose_neigh_stop(struct seq_file *seq, void *v)
 
 static int rose_neigh_show(struct seq_file *seq, void *v)
 {
+        char buf[11];
         int i;
 
         if (v == SEQ_START_TOKEN)
@@ -1189,7 +1191,7 @@ static int rose_neigh_show(struct seq_file *seq, void *v)
                 /* if (!rose_neigh->loopback) { */
                 seq_printf(seq, "%05d %-9s %-4s   %3d %3d  %3s     %3s %3lu %3lu",
                            rose_neigh->number,
-                           (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(&rose_neigh->callsign),
+                           (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign),
                            rose_neigh->dev ? rose_neigh->dev->name : "???",
                            rose_neigh->count,
                            rose_neigh->use,
@@ -1200,7 +1202,7 @@ static int rose_neigh_show(struct seq_file *seq, void *v)
 
                 if (rose_neigh->digipeat != NULL) {
                         for (i = 0; i < rose_neigh->digipeat->ndigi; i++)
-                                seq_printf(seq, " %s", ax2asc(&rose_neigh->digipeat->calls[i]));
+                                seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i]));
                 }
 
                 seq_puts(seq, "\n");
@@ -1260,6 +1262,8 @@ static void rose_route_stop(struct seq_file *seq, void *v)
 
 static int rose_route_show(struct seq_file *seq, void *v)
 {
+        char buf[11];
+
         if (v == SEQ_START_TOKEN)
                 seq_puts(seq, 
                          "lci  address     callsign   neigh  <-> lci  address     callsign   neigh\n");
@@ -1271,7 +1275,7 @@ static int rose_route_show(struct seq_file *seq, void *v)
                                    "%3.3X  %-10s  %-9s  %05d      ",
                                    rose_route->lci1,
                                    rose2asc(&rose_route->src_addr),
-                                   ax2asc(&rose_route->src_call),
+                                   ax2asc(buf, &rose_route->src_call),
                                    rose_route->neigh1->number);
                 else 
                         seq_puts(seq, 
@@ -1282,7 +1286,7 @@ static int rose_route_show(struct seq_file *seq, void *v)
                                    "%3.3X  %-10s  %-9s  %05d\n",
                                 rose_route->lci2,
                                 rose2asc(&rose_route->dest_addr),
-                                ax2asc(&rose_route->dest_call),
+                                ax2asc(buf, &rose_route->dest_call),
                                 rose_route->neigh2->number);
                  else 
                          seq_puts(seq,
diff --git a/net/rose/rose_subr.c b/net/rose/rose_subr.c
index a29a3a960fd6..02891ce2db37 100644
--- a/net/rose/rose_subr.c
+++ b/net/rose/rose_subr.c
@@ -400,6 +400,7 @@ static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose)
 {
         unsigned char *p = buffer + 1;
         char *callsign;
+        char buf[11];
         int len, nb;
 
         /* National Facilities */
@@ -456,7 +457,7 @@ static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose)
 
         *p++ = FAC_CCITT_DEST_NSAP;
 
-        callsign = ax2asc(&rose->dest_call);
+        callsign = ax2asc(buf, &rose->dest_call);
 
         *p++ = strlen(callsign) + 10;
         *p++ = (strlen(callsign) + 9) * 2;              /* ??? */
@@ -471,7 +472,7 @@ static int rose_create_facilities(unsigned char *buffer, struct rose_sock *rose)
 
         *p++ = FAC_CCITT_SRC_NSAP;
 
-        callsign = ax2asc(&rose->source_call);
+        callsign = ax2asc(buf, &rose->source_call);
 
         *p++ = strlen(callsign) + 10;
         *p++ = (strlen(callsign) + 9) * 2;              /* ??? */