analyzer: fix ICE casued by dup2 in sm-fd.cc[PR106551]
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. * gcc.dg/analyzer/fd-uninit-1.c: Remove bogus warning. Signed-off-by: Immad Mir <mirimmad@outlook.com>
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@ -971,7 +971,8 @@ fd_state_machine::check_for_dup (sm_context *sm_ctxt, const supernode *node,
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state_t state_arg_1 = sm_ctxt->get_state (stmt, arg_1);
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if (state_arg_1 == m_stop)
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return;
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if (!(is_constant_fd_p (state_arg_1) || is_valid_fd_p (state_arg_1)))
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if (!(is_constant_fd_p (state_arg_1) || is_valid_fd_p (state_arg_1)
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|| state_arg_1 == m_start))
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{
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check_for_open_fd (sm_ctxt, node, stmt, call, callee_fndecl,
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DIRS_READ_WRITE);
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@ -983,7 +984,7 @@ fd_state_machine::check_for_dup (sm_context *sm_ctxt, const supernode *node,
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case DUP_1:
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if (lhs)
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{
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if (is_constant_fd_p (state_arg_1))
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if (is_constant_fd_p (state_arg_1) || state_arg_1 == m_start)
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sm_ctxt->set_next_state (stmt, lhs, m_unchecked_read_write);
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else
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sm_ctxt->set_next_state (stmt, lhs,
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@ -999,7 +1000,8 @@ fd_state_machine::check_for_dup (sm_context *sm_ctxt, const supernode *node,
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if (state_arg_2 == m_stop)
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return;
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/* Check if -1 was passed as second argument to dup2. */
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if (!(is_constant_fd_p (state_arg_2) || is_valid_fd_p (state_arg_2)))
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if (!(is_constant_fd_p (state_arg_2) || is_valid_fd_p (state_arg_2)
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|| state_arg_2 == m_start))
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{
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sm_ctxt->warn (
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node, stmt, arg_2,
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@ -1011,7 +1013,7 @@ fd_state_machine::check_for_dup (sm_context *sm_ctxt, const supernode *node,
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file descriptor i.e the first argument. */
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if (lhs)
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{
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if (is_constant_fd_p (state_arg_1))
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if (is_constant_fd_p (state_arg_1) || state_arg_1 == m_start)
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sm_ctxt->set_next_state (stmt, lhs, m_unchecked_read_write);
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else
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sm_ctxt->set_next_state (stmt, lhs,
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@ -221,3 +221,28 @@ test_19 (const char *path, void *buf)
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}
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}
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extern int m;
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void
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test_20 ()
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{
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int fd = dup (m);
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close (fd);
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}
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void
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test_21 ()
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{
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int fd = dup2 (m, 1);
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close (fd);
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}
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void
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test_22 (int flags)
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{
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int fd = dup3 (m, 1, flags);
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close (fd);
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}
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@ -9,8 +9,6 @@ test_1 ()
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{
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int m;
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return dup (m); /* { dg-warning "use of uninitialized value 'm'" "uninit" } */
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/* { dg-bogus "'dup' on possibly invalid file descriptor 'm'" "invalid fd false +ve" { xfail *-*-* } .-1 } */
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/* XFAIL: probably covered by fix for PR analyzer/106551. */
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}
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int
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