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From 2263af4c1921520ddc9177c13a176860c0069fab Mon Sep 17 00:00:00 2001
Message-Id: <2263af4c1921520ddc9177c13a176860c0069fab.1387369730.git.minovotn@redhat.com>
In-Reply-To: <091eecc4fa42754760dfff393dabcc2b444e9693.1387369730.git.minovotn@redhat.com>
References: <091eecc4fa42754760dfff393dabcc2b444e9693.1387369730.git.minovotn@redhat.com>
From: Markus Armbruster <armbru@redhat.com>
Date: Tue, 10 Dec 2013 15:29:04 +0100
Subject: [PATCH 04/21] json-parser: fix handling of large whole number values

RH-Author: Markus Armbruster <armbru@redhat.com>
Message-id: <1386689361-30281-2-git-send-email-armbru@redhat.com>
Patchwork-id: 56120
O-Subject: [PATCH 7.0 qemu-kvm 01/18] json-parser: fix handling of large whole number values
Bugzilla: 997915
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Luiz Capitulino <lcapitulino@redhat.com>

From: Michael Roth <mdroth@linux.vnet.ibm.com>

Currently our JSON parser assumes that numbers lacking a fractional
value are integers and attempts to store them as QInt/int64 values. This
breaks in the case where the number overflows/underflows int64 values (which
is still valid JSON)

Fix this by detecting such cases and using a QFloat to store the value
instead.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Amos Kong <akong@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
(cherry picked from commit 3d5b3ec6d460a92245215aaf7b349b0b9e5ffa25)
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 qobject/json-parser.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

Signed-off-by: Michal Novotny <minovotn@redhat.com>
---
 qobject/json-parser.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/qobject/json-parser.c b/qobject/json-parser.c
index 05279c1..e7947b3 100644
--- a/qobject/json-parser.c
+++ b/qobject/json-parser.c
@@ -640,9 +640,29 @@ static QObject *parse_literal(JSONParserContext *ctxt)
     case JSON_STRING:
         obj = QOBJECT(qstring_from_escaped_str(ctxt, token));
         break;
-    case JSON_INTEGER:
-        obj = QOBJECT(qint_from_int(strtoll(token_get_value(token), NULL, 10)));
-        break;
+    case JSON_INTEGER: {
+        /* A possibility exists that this is a whole-valued float where the
+         * fractional part was left out due to being 0 (.0). It's not a big
+         * deal to treat these as ints in the parser, so long as users of the
+         * resulting QObject know to expect a QInt in place of a QFloat in
+         * cases like these.
+         *
+         * However, in some cases these values will overflow/underflow a
+         * QInt/int64 container, thus we should assume these are to be handled
+         * as QFloats/doubles rather than silently changing their values.
+         *
+         * strtoll() indicates these instances by setting errno to ERANGE
+         */
+        int64_t value;
+
+        errno = 0; /* strtoll doesn't set errno on success */
+        value = strtoll(token_get_value(token), NULL, 10);
+        if (errno != ERANGE) {
+            obj = QOBJECT(qint_from_int(value));
+            break;
+        }
+        /* fall through to JSON_FLOAT */
+    }
     case JSON_FLOAT:
         /* FIXME dependent on locale */
         obj = QOBJECT(qfloat_from_double(strtod(token_get_value(token), NULL)));
-- 
1.7.11.7