nano

commit 6283557d2f1466e8f5ff6b0aebb419f395ba083a
parent af90f03ac5d8904cb004b7495a50224896dd6ccf
Author: Benno Schulenberg <bensberg@telfort.nl>
Date:   Fri, 23 Apr 2021 12:20:45 +0200

memory: prevent a use-after-free when the user respects a lock file

This fixes https://savannah.gnu.org/bugs/?60447.

Bug existed since commit 2f718e11 from a month ago.

Diffstat:
M
src/files.c
 | 
8
++++----

1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/src/files.c b/src/files.c
@@ -603,14 +603,14 @@ void close_buffer(void)
 	free(orphan->errormessage);
 
 	openfile = orphan->prev;
+	if (openfile == orphan)
+		openfile = NULL;
+
 	free(orphan);
 
 	/* When just one buffer remains open, show "Exit" in the help lines. */
-	if (openfile == openfile->next)
+	if (openfile && openfile == openfile->next)
 		exitfunc->desc = exit_tag;
-
-	if (openfile == orphan)
-		openfile = NULL;
 }
 #endif /* ENABLE_MULTIBUFFER */