From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EE92C267B05; Sat, 30 May 2026 17:43:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780162982; cv=none; b=XvXPm3iN9fHRLei9CoWSo8tG2P9y2b/IKm4QwcZi0dDAaAMGhz4o4QdFAgi1CQvhC29O0cHYuUURgcbGnymkzWeic9ybiald1RHvRGE6O7l0Tf1J392fHbbhvNva2eiu5a4jzf75bS2yTIB907N+Keg4xzzC7PJ8a9qox0IUVGs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780162982; c=relaxed/simple; bh=B/9nb6FM0ZDCI8GAWgeLoqU3pKRV3sCJ2qgcvV9CeDQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UYbc80Oqe9qGYZQzot4XIY8VohZNVUX+ZOagH8T0sssMP50YStKgGjq3ekAI1YvEDzyDhXPMotbpPD1BWnMkg9bVQz8TAJ25OYmILQisZRuumE5plHGEvTk7hwH37rVGH2Lhl5sx6dUZifTinlfzG2cAGCGe3uHW0UnESKzXGVs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=M5kAeB8O; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="M5kAeB8O" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3F10D1F00893; Sat, 30 May 2026 17:43:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780162981; bh=ci4GkJtiLaxe9bFaabNjScvZ6Vlf6zGUUt5v5/uqeEE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=M5kAeB8OupeWpt8BrAQF5xeJWu5BP8BSdBL7SssHwqZNnWEBuZNxa1ToJUUrpTbG3 BXUfDQVa9+48XPkWOa7wISZr/FR7nJ5vtdi1wyjeq1kkM2wEuaWj0Tjb0RKXKfCCr9 fHDyjC5TqgqCmP39L4DEGYrPkgL2KeyQABhzOqQg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ye Bin , Chao Yu , Jaegeuk Kim , Bin Lan Subject: [PATCH 5.15 122/776] f2fs: fix null-ptr-deref in f2fs_submit_page_bio() Date: Sat, 30 May 2026 17:57:16 +0200 Message-ID: <20260530160243.528920947@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ye Bin commit b7d0a97b28083084ebdd8e5c6bccd12e6ec18faa upstream. There's issue as follows when concurrently installing the f2fs.ko module and mounting the f2fs file system: KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] RIP: 0010:__bio_alloc+0x2fb/0x6c0 [f2fs] Call Trace: f2fs_submit_page_bio+0x126/0x8b0 [f2fs] __get_meta_page+0x1d4/0x920 [f2fs] get_checkpoint_version.constprop.0+0x2b/0x3c0 [f2fs] validate_checkpoint+0xac/0x290 [f2fs] f2fs_get_valid_checkpoint+0x207/0x950 [f2fs] f2fs_fill_super+0x1007/0x39b0 [f2fs] mount_bdev+0x183/0x250 legacy_get_tree+0xf4/0x1e0 vfs_get_tree+0x88/0x340 do_new_mount+0x283/0x5e0 path_mount+0x2b2/0x15b0 __x64_sys_mount+0x1fe/0x270 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e Above issue happens as the biset of the f2fs file system is not initialized before register "f2fs_fs_type". To address above issue just register "f2fs_fs_type" at the last in init_f2fs_fs(). Ensure that all f2fs file system resources are initialized. Fixes: f543805fcd60 ("f2fs: introduce private bioset") Signed-off-by: Ye Bin Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim [ Minor context conflict resolved. ] Signed-off-by: Bin Lan Signed-off-by: Greg Kroah-Hartman --- fs/f2fs/super.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -4634,9 +4634,6 @@ static int __init init_f2fs_fs(void) err = register_shrinker(&f2fs_shrinker_info); if (err) goto free_sysfs; - err = register_filesystem(&f2fs_fs_type); - if (err) - goto free_shrinker; f2fs_create_root_stats(); err = f2fs_init_post_read_processing(); if (err) @@ -4660,6 +4657,7 @@ static int __init init_f2fs_fs(void) if (err) goto free_compress_cache; err = f2fs_init_xattr_cache(); + err = register_filesystem(&f2fs_fs_type); if (err) goto free_casefold_cache; return 0; @@ -4679,8 +4677,6 @@ free_post_read: f2fs_destroy_post_read_processing(); free_root_stats: f2fs_destroy_root_stats(); - unregister_filesystem(&f2fs_fs_type); -free_shrinker: unregister_shrinker(&f2fs_shrinker_info); free_sysfs: f2fs_exit_sysfs(); @@ -4704,6 +4700,7 @@ fail: static void __exit exit_f2fs_fs(void) { + unregister_filesystem(&f2fs_fs_type); f2fs_destroy_xattr_cache(); f2fs_destroy_casefold_cache(); f2fs_destroy_compress_cache(); @@ -4713,7 +4710,6 @@ static void __exit exit_f2fs_fs(void) f2fs_destroy_iostat_processing(); f2fs_destroy_post_read_processing(); f2fs_destroy_root_stats(); - unregister_filesystem(&f2fs_fs_type); unregister_shrinker(&f2fs_shrinker_info); f2fs_exit_sysfs(); f2fs_destroy_garbage_collection_cache();