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([182.217.14.201]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ad9f1d4b03sm26693315ad.29.2026.02.24.08.06.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Feb 2026 08:06:58 -0800 (PST) From: Taerang Kim To: jaegeuk@kernel.org, chao@kernel.org Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzbot+fc026e87558558f75c00@syzkaller.appspotmail.com, Taerang Kim Subject: [PATCH] f2fs: evict: truncate page cache before clear_inode Date: Wed, 25 Feb 2026 01:06:54 +0900 Message-ID: <20260224160654.448538-1-kth5965@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" syzbot reports a BUG_ON(inode->i_data.nrpages) in clear_inode() when mounting a corrupted f2fs image. I agree with Dmitry's RFC that dropping page #0 in f2fs_truncate() can address this reproducer, since f2fs_convert_inline_inode() may grab page #0 via f2fs_grab_cache_folio() and leave it cached on the clear_out success path. However, clear_inode() requires the inode mapping to be empty, and it is hard to guarantee that the page cache can only be populated from this truncate/inline-conversion path. Make f2fs_evict_inode() defensively truncate any remaining page cache before calling clear_inode(), so nrpages is guaranteed to be 0 regardless of how the cache was populated. Link: https://lore.kernel.org/linux-f2fs-devel/20260206092958.578191-1-dman= tipov@yandex.ru/ Reported-by: syzbot+fc026e87558558f75c00@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3Dfc026e87558558f75c00 Signed-off-by: Taerang Kim --- fs/f2fs/inode.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index 38b8994bc1b2..5527bd76f62a 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -1001,6 +1001,13 @@ void f2fs_evict_inode(struct inode *inode) out_clear: fscrypt_put_encryption_info(inode); fsverity_cleanup_inode(inode); + /* + * Defensively truncate any remaining page cache, e.g. + * f2fs_convert_inline_inode() called from f2fs_truncate() + * may leave page #0 behind in the page cache when the + * inline conversion takes the clear_out success path. + */ + truncate_inode_pages_final(&inode->i_data); clear_inode(inode); } =20 --=20 2.43.0