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([2405:201:682f:389d:2136:a371:9567:156f]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b06e445075sm61786745ad.31.2026.03.19.02.19.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Mar 2026 02:19:38 -0700 (PDT) From: Deepanshu Kartikey To: konishi.ryusuke@gmail.com, slava@dubeyko.com Cc: akpm@linux-foundation.org, sato.koji@lab.ntt.co.jp, linux-nilfs@vger.kernel.org, linux-kernel@vger.kernel.org, Deepanshu Kartikey , syzbot+98a040252119df0506f8@syzkaller.appspotmail.com, Deepanshu Kartikey Subject: [PATCH] nilfs2: fix missing continue after -ENOENT in nilfs_ioctl_mark_blocks_dirty() Date: Thu, 19 Mar 2026 14:49:30 +0530 Message-ID: <20260319091930.1088735-1-kartikey406@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" nilfs_ioctl_mark_blocks_dirty() calls nilfs_bmap_lookup_at_level() to get the current block number of each block descriptor. When the lookup returns -ENOENT, meaning the block does not exist, it sets bd_blocknr to 0 and continues processing. However, if bd_oblocknr is also 0, the subsequent check: if (bdescs[i].bd_blocknr !=3D bdescs[i].bd_oblocknr) continue; will not skip the block, and nilfs_bmap_mark() will be called on a non-existent block. This causes nilfs_btree_do_lookup() to return -ENOENT, triggering the WARN_ON(ret =3D=3D -ENOENT). Fix this by adding a continue statement after setting bd_blocknr to 0 when the lookup returns -ENOENT, so that dead blocks are always skipped regardless of the value of bd_oblocknr. Fixes: 7942b919f732 ("nilfs2: ioctl operations") Reported-by: syzbot+98a040252119df0506f8@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3D98a040252119df0506f8 Signed-off-by: Deepanshu Kartikey --- fs/nilfs2/ioctl.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c index e17b8da66491..1615a314f557 100644 --- a/fs/nilfs2/ioctl.c +++ b/fs/nilfs2/ioctl.c @@ -745,6 +745,7 @@ static int nilfs_ioctl_mark_blocks_dirty(struct the_nil= fs *nilfs, if (ret !=3D -ENOENT) return ret; bdescs[i].bd_blocknr =3D 0; + continue; } if (bdescs[i].bd_blocknr !=3D bdescs[i].bd_oblocknr) /* skip dead block */ --=20 2.43.0