[PATCH] Fortran: frontend passes do_subscript leaks gmp memory [PR97345]

[Harald Anlauf <anlauf@gmx.de>]

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Dear all,

the attached obvious patch fixes a memory leak with gmp variables
that are set but apparently (=valgrind) never cleared.  No new
testcase as the current testsuite gives enough coverage
(confirmed by trying a faulty version...) and as per discussion
with Steve (see PR).

Committed after regtesting on x86_64-pc-linux-gnu as:
r13-5095-gfec9fc1a17ec44461cee841513f1b6b8ad680fe4

Thanks,
Harald


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From fec9fc1a17ec44461cee841513f1b6b8ad680fe4 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Tue, 10 Jan 2023 22:41:17 +0100
Subject: [PATCH] Fortran: frontend passes do_subscript leaks gmp memory
 [PR97345]

gcc/fortran/ChangeLog:

	PR fortran/97345
	* frontend-passes.cc (do_subscript): Clear used gmp variables.
---
 gcc/fortran/frontend-passes.cc | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/gcc/fortran/frontend-passes.cc b/gcc/fortran/frontend-passes.cc
index 612c12d233d..db2b98290d6 100644
--- a/gcc/fortran/frontend-passes.cc
+++ b/gcc/fortran/frontend-passes.cc
@@ -2892,7 +2892,12 @@ do_subscript (gfc_expr **e)

 		  cmp = mpz_cmp (do_end, do_start);
 		  if ((sgn > 0 && cmp < 0) || (sgn < 0 && cmp > 0))
-		    break;
+		    {
+		      mpz_clear (do_start);
+		      mpz_clear (do_end);
+		      mpz_clear (do_step);
+		      break;
+		    }
 		}

 	      /* May have to correct the end value if the step does not equal
@@ -2965,6 +2970,12 @@ do_subscript (gfc_expr **e)
 		      mpz_clear (val);
 		    }
 		}
+
+	      if (have_do_start)
+		mpz_clear (do_start);
+	      if (have_do_end)
+		mpz_clear (do_end);
+	      mpz_clear (do_step);
 	    }
 	}
     }
--
2.35.3