linux-kernel - Re: [f2fs-dev] [PATCH 1/1] f2fs-toos:fsck.f2fs Fix bad return value

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Date:   Mon, 2 Nov 2020 19:23:27 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Robin Hsu <robinhsu@...gle.com>,
        linux-f2fs-devel@...ts.sourceforge.net, chao@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH 1/1] f2fs-toos:fsck.f2fs Fix bad return value

On 11/02, Eric Biggers wrote:
> On Mon, Oct 26, 2020 at 05:40:00PM +0800, Robin Hsu via Linux-f2fs-devel wrote:
> > 'ret' should not have been used here: otherwise, it would be wrongly used
> > as the error code and then be returned from main().
> > 
> > Signed-off-by: Robin Hsu <robinhsu@...gle.com>
> > ---
> >  fsck/fsck.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/fsck/fsck.c b/fsck/fsck.c
> > index f97e9fb..66e4e3f 100644
> > --- a/fsck/fsck.c
> > +++ b/fsck/fsck.c
> > @@ -3137,8 +3137,7 @@ int fsck_verify(struct f2fs_sb_info *sbi)
> >  		char ans[255] = {0};
> >  
> >  		printf("\nDo you want to restore lost files into ./lost_found/? [Y/N] ");
> > -		ret = scanf("%s", ans);
> > -		ASSERT(ret >= 0);
> > +		ASSERT(scanf("%s", ans) >= 0);
> >  		if (!strcasecmp(ans, "y")) {
> >  			for (i = 0; i < fsck->nr_nat_entries; i++) {
> >  				if (f2fs_test_bit(i, fsck->nat_area_bitmap))
> 
> This patch causes a compiler warning:
> 
> 	In file included from f2fs.h:33,
> 			 from fsck.h:14,
> 			 from fsck.c:11:
> 	fsck.c: In function 'fsck_verify':
> 	../include/f2fs_fs.h:197:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
> 	    printf("[ASSERT] (%s:%4d) " #exp"\n",  \
> 		   ^~~~~~~~~~~~~~~~~~~~
> 	fsck.c:3151:3: note: in expansion of macro 'ASSERT'
> 	   ASSERT(scanf("%s", ans) >= 0);
> 	   ^~~~~~

Urg. Fixed by this.

>From c986140e3c5abb9eb7a08928a88acb8273f1bd52 Mon Sep 17 00:00:00 2001
From: Robin Hsu <robinhsu@...gle.com>
Date: Mon, 26 Oct 2020 17:40:00 +0800
Subject: [PATCH] f2fs-toos: fsck.f2fs Fix bad return value

'ret' should not have been used here: otherwise, it would be wrongly used
as the error code and then be returned from main().

Signed-off-by: Robin Hsu <robinhsu@...gle.com>
Reviewed-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fsck/fsck.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fsck/fsck.c b/fsck/fsck.c
index 647523397f3e..e52672032d2c 100644
--- a/fsck/fsck.c
+++ b/fsck/fsck.c
@@ -3146,10 +3146,11 @@ int fsck_verify(struct f2fs_sb_info *sbi)
 #ifndef WITH_ANDROID
 	if (nr_unref_nid && !c.ro) {
 		char ans[255] = {0};
+		int res;
 
 		printf("\nDo you want to restore lost files into ./lost_found/? [Y/N] ");
-		ret = scanf("%s", ans);
-		ASSERT(ret >= 0);
+		res = scanf("%s", ans);
+		ASSERT(res >= 0);
 		if (!strcasecmp(ans, "y")) {
 			for (i = 0; i < fsck->nr_nat_entries; i++) {
 				if (f2fs_test_bit(i, fsck->nat_area_bitmap))
-- 
2.29.1.341.ge80a0c044ae-goog