This patch fixes the ICE caused by valid_to_unchecked_state, at analyzer/sm-fd.cc by handling the m_start state in check_for_dup.
Tested lightly on x86_64. gcc/analyzer/ChangeLog: PR analyzer/106551 * sm-fd.cc (check_for_dup): handle the m_start state when transitioning the state of LHS of dup, dup2 and dup3 call. gcc/testsuite/ChangeLog: * gcc.dg/analyzer/fd-dup-1.c: New testcases. Signed-off-by: Immad Mir <mirim...@outlook.com> --- gcc/analyzer/sm-fd.cc | 4 ++-- gcc/testsuite/gcc.dg/analyzer/fd-dup-1.c | 27 +++++++++++++++++++++++- 2 files changed, 28 insertions(+), 3 deletions(-) diff --git a/gcc/analyzer/sm-fd.cc b/gcc/analyzer/sm-fd.cc index 8bb76d72b05..c8b9930a7b6 100644 --- a/gcc/analyzer/sm-fd.cc +++ b/gcc/analyzer/sm-fd.cc @@ -983,7 +983,7 @@ fd_state_machine::check_for_dup (sm_context *sm_ctxt, const supernode *node, case DUP_1: if (lhs) { - if (is_constant_fd_p (state_arg_1)) + if (is_constant_fd_p (state_arg_1) || state_arg_1 == m_start) sm_ctxt->set_next_state (stmt, lhs, m_unchecked_read_write); else sm_ctxt->set_next_state (stmt, lhs, @@ -1011,7 +1011,7 @@ fd_state_machine::check_for_dup (sm_context *sm_ctxt, const supernode *node, file descriptor i.e the first argument. */ if (lhs) { - if (is_constant_fd_p (state_arg_1)) + if (is_constant_fd_p (state_arg_1) || state_arg_1 == m_start) sm_ctxt->set_next_state (stmt, lhs, m_unchecked_read_write); else sm_ctxt->set_next_state (stmt, lhs, diff --git a/gcc/testsuite/gcc.dg/analyzer/fd-dup-1.c b/gcc/testsuite/gcc.dg/analyzer/fd-dup-1.c index eba2570568f..bc823d1ce4e 100644 --- a/gcc/testsuite/gcc.dg/analyzer/fd-dup-1.c +++ b/gcc/testsuite/gcc.dg/analyzer/fd-dup-1.c @@ -220,4 +220,29 @@ test_19 (const char *path, void *buf) close (fd); } -} \ No newline at end of file +} + +extern int m; + +void +test_20 () +{ + int fd = dup (m); /* { dg-warning "'dup' on possibly invalid file descriptor 'm'" } */ + close (fd); +} + +void +test_21 () +{ + int fd = dup2 (m, 1); /* { dg-warning "'dup2' on possibly invalid file descriptor 'm'" } */ + close (fd); +} + +void +test_22 (int flags) +{ + int fd = dup3 (m, 1, flags); /* { dg-warning "'dup3' on possibly invalid file descriptor 'm'" } */ + close (fd); +} + + -- 2.25.1