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Don't parse XML symbols longer than 4096 characters

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It is slow and will use too much memory.

Fixes: QTBUG-91889
Change-Id: I45c5e6038357c87bbb85b1ace17ef39a2a814ea0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 38e111158a38507c63fd70f9ee18b9116b537976)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Allan Sandfeld Jensen 2021-04-14 22:13:32 +02:00 committed by Qt Cherry-pick Bot
parent 609d0d4155
commit b3fed16e9b
1 changed files with 5 additions and 0 deletions
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5
src/corelib/serialization/qxmlstream.cpp
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@ -1297,6 +1297,11 @@ inline int QXmlStreamReaderPrivate::fastScanName(int *prefix)
int n = 0;
uint c;
while ((c = getChar()) != StreamEOF) {
if (n >= 4096) {
// This is too long to be a sensible name, and
// can exhaust memory
return 0;
}
switch (c) {
case '\n':
case ' ':