Re #1703: fixing general bugs. First installment: correct handling of snprintf return value

git-svn-id: http://svn.pjsip.org/repos/pjproject/trunk@4613 74dad513-b988-da41-8d7b-12977e46ad98

5 files changed, 16 insertions, 7 deletions

diff --git a/pjlib/src/pj/errno.c b/pjlib/src/pj/errno.c
index ebfeb9ed..ff54bd4b 100644
--- a/pjlib/src/pj/errno.c
+++ b/pjlib/src/pj/errno.c
@@ -91,6 +91,8 @@ static const struct
  */
 static int pjlib_error(pj_status_t code, char *buf, pj_size_t size)
 {
+    int len;
+
 #if defined(PJ_HAS_ERROR_STRING) && PJ_HAS_ERROR_STRING!=0
     unsigned i;
 
@@ -105,7 +107,10 @@ static int pjlib_error(pj_status_t code, char *buf, pj_size_t size)
     }
 #endif
 
-    return pj_ansi_snprintf( buf, size, "Unknown pjlib error %d", code);
+    len = pj_ansi_snprintf( buf, size, "Unknown pjlib error %d", code);
+    if (len < 1 || len >= (int)size)
+	len = size - 1;
+    return len;
 }
 
 #define IN_RANGE(val,start,end)	    ((val)>=(start) && (val)<(end))
@@ -199,9 +204,9 @@ PJ_DEF(pj_str_t) pj_strerror( pj_status_t statcode,
 	len = pj_ansi_snprintf( buf, bufsize, "Unknown error %d", statcode);
     }
 
-    if (len < 1) {
-        *buf = '\0';
-        len = 0;
+    if (len < 1 || len >= (int)bufsize) {
+	len = bufsize - 1;
+	buf[len] = '\0';
     }
 
     errstr.ptr = buf;
diff --git a/pjlib/src/pj/lock.c b/pjlib/src/pj/lock.c
index a521fd49..d7f4ffaf 100644
--- a/pjlib/src/pj/lock.c
+++ b/pjlib/src/pj/lock.c
@@ -683,7 +683,7 @@ PJ_DEF(void) pj_grp_lock_dump(pj_grp_lock_t *grp_lock)
 	int len;
 
 	len = pj_ansi_snprintf(start, max_len, "%s:%d ", ref->file, ref->line);
-	if (len < 1 || len > max_len) {
+	if (len < 1 || len >= max_len) {
 	    len = strlen(ref->file);
 	    if (len > max_len - 1)
 		len = max_len - 1;
diff --git a/pjlib/src/pj/log.c b/pjlib/src/pj/log.c
index 47b6b0fc..bb808dac 100644
--- a/pjlib/src/pj/log.c
+++ b/pjlib/src/pj/log.c
@@ -445,6 +445,9 @@ PJ_DEF(void) pj_log( const char *sender, int level,
 	print_len = pj_ansi_snprintf(pre, sizeof(log_buffer)-len, 
 				     "<logging error: msg too long>");
     }
+    if (print_len < 1 || print_len >= (int)(sizeof(log_buffer)-len)) {
+	print_len = sizeof(log_buffer) - len - 1;
+    }
     len = len + print_len;
     if (len > 0 && len < (int)sizeof(log_buffer)-2) {
 	if (log_decor & PJ_LOG_HAS_CR) {
diff --git a/pjlib/src/pj/os_error_symbian.cpp b/pjlib/src/pj/os_error_symbian.cpp
index 4af9b30e..d04907fe 100644
--- a/pjlib/src/pj/os_error_symbian.cpp
+++ b/pjlib/src/pj/os_error_symbian.cpp
@@ -162,7 +162,7 @@ PJ_DEF(int) platform_strerror( pj_os_err_type os_errcode,
     }
 
     if (!len) {
-	len = pj_ansi_snprintf( buf, bufsize, "Symbian native error %d", 
+	len = pj_ansi_snprintf( buf, bufsize-1, "Symbian native error %d",
 				os_errcode);
 	buf[len] = '\0';
     }
diff --git a/pjlib/src/pj/ssl_sock_ossl.c b/pjlib/src/pj/ssl_sock_ossl.c
index 281e6f8a..7c2b8461 100644
--- a/pjlib/src/pj/ssl_sock_ossl.c
+++ b/pjlib/src/pj/ssl_sock_ossl.c
@@ -272,7 +272,8 @@ static pj_str_t ssl_strerror(pj_status_t status,
     errstr.slen = pj_ansi_snprintf(buf, bufsize, 
 				   "Unknown OpenSSL error %lu",
 				   ssl_err);
-
+    if (errstr.slen < 1 || errstr.slen >= (int)bufsize)
+	errstr.slen = bufsize - 1;
     return errstr;
 }