Merge remote-tracking branch 'remotes/armbru/tags/pull-error-2016-06-20' into staging

Error reporting patches for 2016-06-20

# gpg: Signature made Mon 20 Jun 2016 15:56:15 BST
# gpg:                using RSA key 0x3870B400EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-error-2016-06-20:
  log: Fix qemu_set_log_filename() error handling
  log: Fix qemu_set_dfilter_ranges() error reporting
  log: Plug memory leak on multiple -dfilter
  coccinelle: Remove unnecessary variables for function return value
  error: Remove unnecessary local_err variables
  error: Remove NULL checks on error_propagate() calls
  vl: Error messages need to go to stderr, fix some

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 65 insertions, 57 deletions

diff --git a/util/log.c b/util/log.c
index 5ad72c1..32e4160 100644
--- a/util/log.c
+++ b/util/log.c
@@ -22,6 +22,7 @@
 #include "qemu/log.h"
 #include "qemu/range.h"
 #include "qemu/error-report.h"
+#include "qapi/error.h"
 #include "qemu/cutils.h"
 #include "trace/control.h"
 
@@ -102,7 +103,7 @@ void qemu_log_needs_buffers(void)
  * substituted with the current PID. This is useful for debugging many
  * nested linux-user tasks but will result in lots of logs.
  */
-void qemu_set_log_filename(const char *filename)
+void qemu_set_log_filename(const char *filename, Error **errp)
 {
     char *pidstr;
     g_free(logfilename);
@@ -111,8 +112,8 @@ void qemu_set_log_filename(const char *filename)
     if (pidstr) {
         /* We only accept one %d, no other format strings */
         if (pidstr[1] != 'd' || strchr(pidstr + 2, '%')) {
-            error_report("Bad logfile format: %s", filename);
-            logfilename = NULL;
+            error_setg(errp, "Bad logfile format: %s", filename);
+            return;
         } else {
             logfilename = g_strdup_printf(filename, getpid());
         }
@@ -142,68 +143,75 @@ bool qemu_log_in_addr_range(uint64_t addr)
 }
 
 
-void qemu_set_dfilter_ranges(const char *filter_spec)
+void qemu_set_dfilter_ranges(const char *filter_spec, Error **errp)
 {
     gchar **ranges = g_strsplit(filter_spec, ",", 0);
-    if (ranges) {
-        gchar **next = ranges;
-        gchar *r = *next++;
-        debug_regions = g_array_sized_new(FALSE, FALSE,
-                                          sizeof(Range), g_strv_length(ranges));
-        while (r) {
-            char *range_op = strstr(r, "-");
-            char *r2 = range_op ? range_op + 1 : NULL;
-            if (!range_op) {
-                range_op = strstr(r, "+");
-                r2 = range_op ? range_op + 1 : NULL;
-            }
-            if (!range_op) {
-                range_op = strstr(r, "..");
-                r2 = range_op ? range_op + 2 : NULL;
-            }
-            if (range_op) {
-                const char *e = NULL;
-                uint64_t r1val, r2val;
+    int i;
 
-                if ((qemu_strtoull(r, &e, 0, &r1val) == 0) &&
-                    (qemu_strtoull(r2, NULL, 0, &r2val) == 0) &&
-                    r2val > 0) {
-                    struct Range range;
+    if (debug_regions) {
+        g_array_unref(debug_regions);
+        debug_regions = NULL;
+    }
 
-                    g_assert(e == range_op);
+    debug_regions = g_array_sized_new(FALSE, FALSE,
+                                      sizeof(Range), g_strv_length(ranges));
+    for (i = 0; ranges[i]; i++) {
+        const char *r = ranges[i];
+        const char *range_op, *r2, *e;
+        uint64_t r1val, r2val;
+        struct Range range;
 
-                    switch (*range_op) {
-                    case '+':
-                    {
-                        range.begin = r1val;
-                        range.end = r1val + (r2val - 1);
-                        break;
-                    }
-                    case '-':
-                    {
-                        range.end = r1val;
-                        range.begin = r1val - (r2val - 1);
-                        break;
-                    }
-                    case '.':
-                        range.begin = r1val;
-                        range.end = r2val;
-                        break;
-                    default:
-                        g_assert_not_reached();
-                    }
-                    g_array_append_val(debug_regions, range);
+        range_op = strstr(r, "-");
+        r2 = range_op ? range_op + 1 : NULL;
+        if (!range_op) {
+            range_op = strstr(r, "+");
+            r2 = range_op ? range_op + 1 : NULL;
+        }
+        if (!range_op) {
+            range_op = strstr(r, "..");
+            r2 = range_op ? range_op + 2 : NULL;
+        }
+        if (!range_op) {
+            error_setg(errp, "Bad range specifier");
+            goto out;
+        }
 
-                } else {
-                    g_error("Failed to parse range in: %s", r);
-                }
-            } else {
-                g_error("Bad range specifier in: %s", r);
-            }
-            r = *next++;
+        if (qemu_strtoull(r, &e, 0, &r1val)
+            || e != range_op) {
+            error_setg(errp, "Invalid number to the left of %.*s",
+                       (int)(r2 - range_op), range_op);
+            goto out;
+        }
+        if (qemu_strtoull(r2, NULL, 0, &r2val)) {
+            error_setg(errp, "Invalid number to the right of %.*s",
+                       (int)(r2 - range_op), range_op);
+            goto out;
+        }
+        if (r2val == 0) {
+            error_setg(errp, "Invalid range");
+            goto out;
+        }
+
+        switch (*range_op) {
+        case '+':
+            range.begin = r1val;
+            range.end = r1val + (r2val - 1);
+            break;
+        case '-':
+            range.end = r1val;
+            range.begin = r1val - (r2val - 1);
+            break;
+        case '.':
+            range.begin = r1val;
+            range.end = r2val;
+            break;
+        default:
+            g_assert_not_reached();
         }
-        g_strfreev(ranges);
+        g_array_append_val(debug_regions, range);
     }
+out:
+    g_strfreev(ranges);
 }
 
 /* fflush() the log file */