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-rw-r--r--shell/hush.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/shell/hush.c b/shell/hush.c
index 3407711cd..c4b124825 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -1683,9 +1683,15 @@ static void close_all_HFILE_list(void)
* It is disastrous if we share memory with a vforked parent.
* I'm not sure we never come here after vfork.
* Therefore just close fd, nothing more.
+ *
+ * ">" instead of ">=": we don't close fd#0,
+ * interactive shell uses hfopen(NULL) as stdin input
+ * which has fl->fd == 0, but fd#0 gets redirected in pipes.
+ * If we'd close it here, then e.g. interactive "set | sort"
+ * with NOFORKed sort, would have sort's input fd closed.
*/
- /*hfclose(fl); - unsafe */
- if (fl->fd >= 0)
+ if (fl->fd > 0)
+ /*hfclose(fl); - unsafe */
close(fl->fd);
fl = fl->next_hfile;
}