linux-kernel - [PATCH 3/5] exec: binfmt_misc: remove the confusing e->interp

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Date:   Fri, 22 Sep 2017 16:36:47 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>
Cc:     Ben Woodard <woodard@...hat.com>,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        Jim Foraker <foraker1@...l.gov>,
        Kees Cook <keescook@...omium.org>,
        Travis Gummels <tgummels@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] exec: binfmt_misc: remove the confusing e->interp_file
 != NULL checks

If MISC_FMT_OPEN_FILE flag is set e->interp_file must be valid or we
have a bug which should not be silently ignored.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 fs/binfmt_misc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 040ed26..45809c6 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -205,7 +205,7 @@ static int load_misc_binary(struct linux_binprm *bprm)
 	if (retval < 0)
 		goto error;
 
-	if (fmt->flags & MISC_FMT_OPEN_FILE && fmt->interp_file) {
+	if (fmt->flags & MISC_FMT_OPEN_FILE) {
 		interp_file = filp_clone_open(fmt->interp_file);
 		if (!IS_ERR(interp_file))
 			deny_write_access(interp_file);
@@ -593,7 +593,7 @@ static void bm_evict_inode(struct inode *inode)
 {
 	Node *e = inode->i_private;
 
-	if ((e->flags & MISC_FMT_OPEN_FILE) && e->interp_file)
+	if (e->flags & MISC_FMT_OPEN_FILE)
 		filp_close(e->interp_file, NULL);
 
 	clear_inode(inode);
-- 
2.5.0