diff options
| author | Andrew Smolko <andrewsmolko@gmail.com> | 2018-11-08 18:18:55 +0300 |
|---|---|---|
| committer | Andrew Smolko <andrewsmolko@gmail.com> | 2018-11-22 14:02:03 +0000 |
| commit | 755521aba6d63fc572b5b3ee43193ea24a2d5513 (patch) | |
| tree | 57904474ecdb2c1267c995e7290beb7bc3fbdec0 | |
| parent | 46076f73337d6b0fea9a006dab2af8864571ae2c (diff) | |
Fix hang in QMacPasteboard::formats()
PasteboardGetItemCount() can return -1 as result to unsigned variable,
so the further loop will iterate "forever". Return early to avoid hang.
Change-Id: Ie91dba1c193d04513f0496d20bd0b6b0b5b6c151
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
| -rw-r--r-- | src/plugins/platforms/cocoa/qmacclipboard.mm | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/src/plugins/platforms/cocoa/qmacclipboard.mm b/src/plugins/platforms/cocoa/qmacclipboard.mm index f3467fdc73..3a39e32fb5 100644 --- a/src/plugins/platforms/cocoa/qmacclipboard.mm +++ b/src/plugins/platforms/cocoa/qmacclipboard.mm @@ -49,6 +49,7 @@ #include <stdlib.h> #include <string.h> #include "qcocoahelpers.h" +#include <type_traits> QT_BEGIN_NAMESPACE @@ -61,6 +62,23 @@ QT_BEGIN_NAMESPACE QMacPasteboard code *****************************************************************************/ +namespace +{ +OSStatus PasteboardGetItemCountSafe(PasteboardRef paste, ItemCount *cnt) +{ + Q_ASSERT(paste); + Q_ASSERT(cnt); + const OSStatus result = PasteboardGetItemCount(paste, cnt); + // Despite being declared unsigned, this API can return -1 + if (std::make_signed<ItemCount>::type(*cnt) < 0) + *cnt = 0; + return result; +} +} // namespace + +// Ensure we don't call the broken one later on +#define PasteboardGetItemCount + class QMacMimeData : public QMimeData { public: @@ -210,7 +228,7 @@ QMacPasteboard::hasOSType(int c_flavor) const sync(); ItemCount cnt = 0; - if (PasteboardGetItemCount(paste, &cnt) || !cnt) + if (PasteboardGetItemCountSafe(paste, &cnt) || !cnt) return false; #ifdef DEBUG_PASTEBOARD @@ -257,7 +275,7 @@ QMacPasteboard::hasFlavor(QString c_flavor) const sync(); ItemCount cnt = 0; - if (PasteboardGetItemCount(paste, &cnt) || !cnt) + if (PasteboardGetItemCountSafe(paste, &cnt) || !cnt) return false; #ifdef DEBUG_PASTEBOARD @@ -374,7 +392,7 @@ QMacPasteboard::formats() const QStringList ret; ItemCount cnt = 0; - if (PasteboardGetItemCount(paste, &cnt) || !cnt) + if (PasteboardGetItemCountSafe(paste, &cnt) || !cnt) return ret; #ifdef DEBUG_PASTEBOARD @@ -417,7 +435,7 @@ QMacPasteboard::hasFormat(const QString &format) const sync(); ItemCount cnt = 0; - if (PasteboardGetItemCount(paste, &cnt) || !cnt) + if (PasteboardGetItemCountSafe(paste, &cnt) || !cnt) return false; #ifdef DEBUG_PASTEBOARD @@ -460,7 +478,7 @@ QMacPasteboard::retrieveData(const QString &format, QVariant::Type) const sync(); ItemCount cnt = 0; - if (PasteboardGetItemCount(paste, &cnt) || !cnt) + if (PasteboardGetItemCountSafe(paste, &cnt) || !cnt) return QByteArray(); #ifdef DEBUG_PASTEBOARD |