r254015 - in /branches/gcc-7-branch/libstdc++-v...

[redi@gcc.gnu.org]

Author: redi
Date: Mon Oct 23 17:16:38 2017
New Revision: 254015

URL: https://gcc.gnu.org/viewcvs?rev=254015&root=gcc&view=rev
Log:
PR libstdc++/81395 fix crash when write follows large read

Backport from mainline
2017-07-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/81395
	* include/bits/fstream.tcc (basic_filebuf::xsgetn): Don't set buffer
	pointers for write mode after reading.
	* testsuite/27_io/basic_filebuf/sgetn/char/81395.cc: New.

Added:
    branches/gcc-7-branch/libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/81395.cc
Modified:
    branches/gcc-7-branch/libstdc++-v3/ChangeLog
    branches/gcc-7-branch/libstdc++-v3/include/bits/fstream.tcc