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Fix undefined behavior in ProString/ProKey::appendTo

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We must not pass null pointers to memcpy.

Pick-to: 6.0
Fixes: QTBUG-88780
Change-Id: Ic1d77b4672310a3f6d0d4fbee5f2889e3e4d219d
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
This commit is contained in:
Joerg Bornemann 2020-12-01 16:30:54 +01:00
parent c19695ab95
commit 21e7777230
1 changed files with 4 additions and 0 deletions
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4
qmake/library/proitems.h
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@ -233,6 +233,8 @@ template <> struct QConcatenable<ProString> : private QAbstractConcatenable
static inline void appendTo(const ProString &a, QChar *&out) static inline void appendTo(const ProString &a, QChar *&out)
{ {
const auto n = a.size(); const auto n = a.size();
if (!n)
return;
memcpy(out, a.toQStringView().data(), sizeof(QChar) * n); memcpy(out, a.toQStringView().data(), sizeof(QChar) * n);
out += n; out += n;
} }
@ -247,6 +249,8 @@ template <> struct QConcatenable<ProKey> : private QAbstractConcatenable
static inline void appendTo(const ProKey &a, QChar *&out) static inline void appendTo(const ProKey &a, QChar *&out)
{ {
const auto n = a.size(); const auto n = a.size();
if (!n)
return;
memcpy(out, a.toQStringView().data(), sizeof(QChar) * n); memcpy(out, a.toQStringView().data(), sizeof(QChar) * n);
out += n; out += n;
} }