QString: Fix UBs (signed overflow) in hashed string search

Similar change to 390ea21873cf229447c2dcaea85a40e472fab03c, but more
extensive because the hash variables were not, yet, of unsigned type.

This brings the three hashed string search algorithms in QtBase (in
QString, QByteArray and QByteArrayMatcher) in line again.

Found by UBSan, fixing the following bunch of errors:

  tools/qstring.cpp:3080:38: runtime error: left shift of negative value -1291179264
  tools/qstring.cpp:3081:42: runtime error: left shift of negative value -1291179264
  tools/qstring.cpp:3091:13: runtime error: left shift of 73 by 26 places cannot be represented in type 'int'
  tools/qstring.cpp:3091:13: runtime error: left shift of negative value -1255957171
  tools/qstring.cpp:3091:13: runtime error: signed integer overflow: 1783052986 - -1207959552 cannot be represented in type 'int'
  tools/qstring.cpp:3097:37: runtime error: left shift of negative value -1298753576
  tools/qstring.cpp:3098:41: runtime error: left shift of negative value -1298753576
  tools/qstring.cpp:3107:13: runtime error: left shift of negative value -1508912760
  tools/qstring.cpp:3158:38: runtime error: left shift of negative value -677037574
  tools/qstring.cpp:3159:42: runtime error: left shift of negative value -677037574
  tools/qstring.cpp:3169:13: runtime error: left shift of negative value -1657715810
  tools/qstring.cpp:3173:38: runtime error: left shift of negative value -677037574
  tools/qstring.cpp:3174:42: runtime error: left shift of negative value -677037574
  tools/qstring.cpp:3183:13: runtime error: left shift of negative value -1657715810

Change-Id: I1436eb61369919df9fe34251f863dd54fb58af98
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

0 files changed, 0 insertions, 0 deletions