bug69975.phpt - OpenGrok history log for /PHP-7.4/ext/odbc/tests/bug69975.phpt

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# 82637e81	02-Jul-2015	Christoph M. Becker	Fix #69975: PHP segfaults when accessing nvarchar(max) defined columns The SQL Server Native Client 11.0 and maybe other ODBC drivers report NVARCHAR(MAX) columns as SQL_WVARCHAR with si Fix #69975: PHP segfaults when accessing nvarchar(max) defined columns The SQL Server Native Client 11.0 and maybe other ODBC drivers report NVARCHAR(MAX) columns as SQL_WVARCHAR with size 0. This causes too small a buffer to be emalloc'd, likely causing a segfault in the following. As we don't know the real size of the column data, we treat such colums as SQL_WLONGVARCHAR. The related bug #67437 suggests that some drivers report a size of ~4GB. It is not certain that this is really the case (there might be some integer overflow involved, and anyway, there has been no feedback), so we do not cater for this now. However, it would not be hard to treat all sizes above a certain threshold in a similar way, i.e. as SQL_WLONGVARCHAR. (cherry picked from commit 16db4d1462bf3eacb93c0cd940f799160a284b24) (cherry picked from commit 344ff5dd4c538eaebea075f7705321f8b86d0b47) show more ...
# 16db4d14	02-Jul-2015	Christoph M. Becker	Fix #69975: PHP segfaults when accessing nvarchar(max) defined columns The SQL Server Native Client 11.0 and maybe other ODBC drivers report NVARCHAR(MAX) columns as SQL_WVARCHAR with si Fix #69975: PHP segfaults when accessing nvarchar(max) defined columns The SQL Server Native Client 11.0 and maybe other ODBC drivers report NVARCHAR(MAX) columns as SQL_WVARCHAR with size 0. This causes too small a buffer to be emalloc'd, likely causing a segfault in the following. As we don't know the real size of the column data, we treat such colums as SQL_WLONGVARCHAR. The related bug #67437 suggests that some drivers report a size of ~4GB. It is not certain that this is really the case (there might be some integer overflow involved, and anyway, there has been no feedback), so we do not cater for this now. However, it would not be hard to treat all sizes above a certain threshold in a similar way, i.e. as SQL_WLONGVARCHAR. show more ...