s390: qeth: Fix potential array overrun in cmd/rc lookup

Functions qeth_get_ipa_msg and qeth_get_ipa_cmd_name are modifying
the last member of global arrays without any locking that I can see.
If two instances of either function are running at the same time,
it could cause a race ultimately leading to an array overrun (the
contents of the last entry of the array is the only guarantee that
the loop will ever stop).

Performing the lookups without modifying the arrays is admittedly
slower (two comparisons per iteration instead of one) but these
are operations which are rare (should only be needed in error
cases or when debugging, not during successful operation) and it
seems still less costly than introducing a mutex to protect the
arrays in question.

As a side bonus, it allows us to declare both arrays as const data.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Julian Wiedmann <jwi@linux.ibm.com>
Cc: Ursula Braun <ubraun@linux.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index de8282420f966f0d0f984c72868d9ebddcf11207..ffce6f39828aa1799c49975df1d85fe2d8ccbe38 100644 (file)
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -610,7 +610,7 @@ static void qeth_put_reply(struct qeth_reply *reply)
 static void qeth_issue_ipa_msg(struct qeth_ipa_cmd *cmd, int rc,
                struct qeth_card *card)
 {
-       char *ipa_name;
+       const char *ipa_name;
        int com = cmd->hdr.command;
        ipa_name = qeth_get_ipa_cmd_name(com);
        if (rc)

diff --git a/drivers/s390/net/qeth_core_mpc.c b/drivers/s390/net/qeth_core_mpc.c
index e8263ded0af0905671d362e78f435dba5f1b4c57..e891c0b52f4ccc79995b6c60a8a05e6e12f92005 100644 (file)
--- a/drivers/s390/net/qeth_core_mpc.c
+++ b/drivers/s390/net/qeth_core_mpc.c
@@ -148,10 +148,10 @@ EXPORT_SYMBOL_GPL(IPA_PDU_HEADER);
 
 struct ipa_rc_msg {
        enum qeth_ipa_return_codes rc;
-       char *msg;
+       const char *msg;
 };
 
-static struct ipa_rc_msg qeth_ipa_rc_msg[] = {
+static const struct ipa_rc_msg qeth_ipa_rc_msg[] = {
        {IPA_RC_SUCCESS,                "success"},
        {IPA_RC_NOTSUPP,                "Command not supported"},
        {IPA_RC_IP_TABLE_FULL,          "Add Addr IP Table Full - ipv6"},
@@ -219,22 +219,23 @@ static struct ipa_rc_msg qeth_ipa_rc_msg[] = {
 
 
 
-char *qeth_get_ipa_msg(enum qeth_ipa_return_codes rc)
+const char *qeth_get_ipa_msg(enum qeth_ipa_return_codes rc)
 {
-       int x = 0;
-       qeth_ipa_rc_msg[ARRAY_SIZE(qeth_ipa_rc_msg) - 1].rc = rc;
-       while (qeth_ipa_rc_msg[x].rc != rc)
-               x++;
+       int x;
+
+       for (x = 0; x < ARRAY_SIZE(qeth_ipa_rc_msg) - 1; x++)
+               if (qeth_ipa_rc_msg[x].rc == rc)
+                       return qeth_ipa_rc_msg[x].msg;
        return qeth_ipa_rc_msg[x].msg;
 }
 
 
 struct ipa_cmd_names {
        enum qeth_ipa_cmds cmd;
-       char *name;
+       const char *name;
 };
 
-static struct ipa_cmd_names qeth_ipa_cmd_names[] = {
+static const struct ipa_cmd_names qeth_ipa_cmd_names[] = {
        {IPA_CMD_STARTLAN,      "startlan"},
        {IPA_CMD_STOPLAN,       "stoplan"},
        {IPA_CMD_SETVMAC,       "setvmac"},
@@ -266,11 +267,12 @@ static struct ipa_cmd_names qeth_ipa_cmd_names[] = {
        {IPA_CMD_UNKNOWN,       "unknown"},
 };
 
-char *qeth_get_ipa_cmd_name(enum qeth_ipa_cmds cmd)
+const char *qeth_get_ipa_cmd_name(enum qeth_ipa_cmds cmd)
 {
-       int x = 0;
-       qeth_ipa_cmd_names[ARRAY_SIZE(qeth_ipa_cmd_names) - 1].cmd = cmd;
-       while (qeth_ipa_cmd_names[x].cmd != cmd)
-               x++;
+       int x;
+
+       for (x = 0; x < ARRAY_SIZE(qeth_ipa_cmd_names) - 1; x++)
+               if (qeth_ipa_cmd_names[x].cmd == cmd)
+                       return qeth_ipa_cmd_names[x].name;
        return qeth_ipa_cmd_names[x].name;
 }

diff --git a/drivers/s390/net/qeth_core_mpc.h b/drivers/s390/net/qeth_core_mpc.h
index aa8b9196b089e0c9b2788493d5103dd5b38ad33d..aa5de1fe01e10068b8913d814c27a9a63bdc95d9 100644 (file)
--- a/drivers/s390/net/qeth_core_mpc.h
+++ b/drivers/s390/net/qeth_core_mpc.h
@@ -797,8 +797,8 @@ enum qeth_ipa_arp_return_codes {
        QETH_IPA_ARP_RC_Q_NO_DATA    = 0x0008,
 };
 
-extern char *qeth_get_ipa_msg(enum qeth_ipa_return_codes rc);
-extern char *qeth_get_ipa_cmd_name(enum qeth_ipa_cmds cmd);
+extern const char *qeth_get_ipa_msg(enum qeth_ipa_return_codes rc);
+extern const char *qeth_get_ipa_cmd_name(enum qeth_ipa_cmds cmd);
 
 #define QETH_SETASS_BASE_LEN (sizeof(struct qeth_ipacmd_hdr) + \
                               sizeof(struct qeth_ipacmd_setassparms_hdr))