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-rw-r--r--erts/emulator/beam/erl_mtrace.c7
-rw-r--r--erts/emulator/drivers/common/inet_drv.c13
2 files changed, 11 insertions, 9 deletions
diff --git a/erts/emulator/beam/erl_mtrace.c b/erts/emulator/beam/erl_mtrace.c
index e275867928..bb6f8660f1 100644
--- a/erts/emulator/beam/erl_mtrace.c
+++ b/erts/emulator/beam/erl_mtrace.c
@@ -572,7 +572,7 @@ void erts_mtrace_pre_init(void)
void erts_mtrace_init(char *receiver, char *nodename)
{
- char hostname[MAXHOSTNAMELEN];
+ char hostname[MAXHOSTNAMELEN + 1];
char pid[21]; /* enough for a 64 bit number */
socket_desc = ERTS_SOCK_INVALID_SOCKET;
@@ -613,9 +613,10 @@ void erts_mtrace_init(char *receiver, char *nodename)
}
tracep = trace_buffer;
endp = trace_buffer + TRACE_BUF_SZ;
- if (erts_sock_gethostname(hostname, MAXHOSTNAMELEN) != 0)
+ /* gethostname requires that the len is max(hostname) + 1 */
+ if (erts_sock_gethostname(hostname, MAXHOSTNAMELEN + 1) != 0)
hostname[0] = '\0';
- hostname[MAXHOSTNAMELEN-1] = '\0';
+ hostname[MAXHOSTNAMELEN] = '\0';
sys_get_pid(pid, sizeof(pid));
write_trace_header(nodename ? nodename : "", pid, hostname);
erts_mtrace_update_heap_size();
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index 1885338ce5..b619e6ebb9 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -8345,10 +8345,10 @@ static ErlDrvData inet_start(ErlDrvPort port, int size, int protocol)
return (ErlDrvData)desc;
}
-
-#ifndef MAXHOSTNAMELEN
-#define MAXHOSTNAMELEN 256
-#endif
+/* MAXHOSTNAMELEN could be 64 or 255 depending
+on the platform. Instead, use INET_MAXHOSTNAMELEN
+which is always 255 across all platforms */
+#define INET_MAXHOSTNAMELEN 255
/*
** common TCP/UDP/SCTP control command
@@ -8525,13 +8525,14 @@ static ErlDrvSSizeT inet_ctl(inet_descriptor* desc, int cmd, char* buf,
}
case INET_REQ_GETHOSTNAME: { /* get host name */
- char tbuf[MAXHOSTNAMELEN];
+ char tbuf[INET_MAXHOSTNAMELEN + 1];
DEBUGF(("inet_ctl(%ld): GETHOSTNAME\r\n", (long)desc->port));
if (len != 0)
return ctl_error(EINVAL, rbuf, rsize);
- if (IS_SOCKET_ERROR(sock_hostname(tbuf, MAXHOSTNAMELEN)))
+ /* gethostname requires len to be max(hostname) + 1 */
+ if (IS_SOCKET_ERROR(sock_hostname(tbuf, INET_MAXHOSTNAMELEN + 1)))
return ctl_error(sock_errno(), rbuf, rsize);
return ctl_reply(INET_REP_OK, tbuf, strlen(tbuf), rbuf, rsize);
}