https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127892
--- Comment #9 from Harald Anlauf <anlauf at gcc dot gnu.org> --- (In reply to GCC Commits from comment #8) > The master branch has been updated by Harald Anlauf <[email protected]>: > > https://gcc.gnu.org/g:7099a54b01a0cd04247fe88e3545916ab5ee0d22 > > commit r17-5419-g7099a54b01a0cd04247fe88e3545916ab5ee0d22 > Author: Harald Anlauf <[email protected]> > Date: Tue Oct 20 20:29:19 2026 +0200 > > fortran: Prevent gfc_copy_expr() truncating strings containing NUL > [PR127892] > > gfc_copy_expr() would create a truncated copy of the internal > representation of a string when it contained a NUL character. This can > occur while simplifying TRANSFER when the physical representation of its > result is longer than that of SOURCE, and MOLD is of type CHARACTER. Oops, that should have read "shorter" instead of "longer"... > This lead to an invalid read reported by valgrind. > > PR fortran/127892 > > gcc/fortran/ChangeLog: > > * expr.cc (gfc_copy_expr): Ensure that the result representation > length is the same as that of the source. > * gfortran.h (gfc_char_to_widechar): Adjust prototype. > * scanner.cc (gfc_char_to_widechar): Add optional argument for > the result representation length, instead of deriving it from the > string argument.
