Avoid memory corruption if INFO<0

martin-frbg · web-flow · commit 76ce5053f411 · 2025-05-17T14:59:29.000+02:00
diff --git a/SRC/sgeev.f b/SRC/sgeev.f
@@ -519,7 +519,7 @@ SUBROUTINE SGEEV( JOBVL, JOBVR, N, A, LDA, WR, WI, VL, LDVL,
 *     Undo scaling if necessary
 *
    50 CONTINUE
-      IF( SCALEA ) THEN
+      IF( SCALEA .AND. INFO.GE.0 ) THEN
          CALL SLASCL( 'G', 0, 0, CSCALE, ANRM, N-INFO, 1,
      $                WR( INFO+1 ),
      $                MAX( N-INFO, 1 ), IERR )

Original file line number	Diff line number	Diff line change
`@@ -519,7 +519,7 @@ SUBROUTINE SGEEV( JOBVL, JOBVR, N, A, LDA, WR, WI, VL, LDVL,`
`519`	`519`	`* Undo scaling if necessary`
`520`	`520`	`*`
`521`	`521`	`50 CONTINUE`
`522`		`- IF( SCALEA ) THEN`
	`522`	`+ IF( SCALEA .AND. INFO.GE.0 ) THEN`
`523`	`523`	`CALL SLASCL( 'G', 0, 0, CSCALE, ANRM, N-INFO, 1,`
`524`	`524`	`$ WR( INFO+1 ),`
`525`	`525`	`$ MAX( N-INFO, 1 ), IERR )`