Fwd: [ammarfaizi2-block:google/android/kernel/common/upstream-f2fs-stable-linux-5.15.y 115/361] fs/f2fs/data.c:996 f2fs_grab_read_bio() warn: variable dereferenced before check 'bio' (see line 995)

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From: Ammar Faizi <[email protected]>
To: Jaegeuk Kim <[email protected]>
Cc: Dan Carpenter <[email protected]>,
	Ammar Faizi <[email protected]>,
	GNU/Weeb Mailing List <[email protected]>,
	[email protected], [email protected],
	[email protected]
Subject: Fwd: [ammarfaizi2-block:google/android/kernel/common/upstream-f2fs-stable-linux-5.15.y 115/361] fs/f2fs/data.c:996 f2fs_grab_read_bio() warn: variable dereferenced before check 'bio' (see line 995)
Date: Mon, 23 Jan 2023 19:24:17 +0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <Y853lht6nq1emVj6@kadam>

commit e8e3f1a12d05d0aef2c819664890b540dfb055af
Author:     Christoph Hellwig <[email protected]>
AuthorDate: Mon Feb 28 14:41:22 2022 +0200
Commit:     Jaegeuk Kim <[email protected]>
CommitDate: Thu Apr 28 15:51:57 2022 -0700

     f2fs: don't pass a bio to f2fs_target_device
     
     Set the bdev at bio allocation time by changing the f2fs_target_device
     calling conventions, so that no bio needs to be passed in.
     
     Signed-off-by: Christoph Hellwig <[email protected]>
     Reviewed-by: Chao Yu <[email protected]>
     Link: https://lore.kernel.org/r/[email protected]
     Signed-off-by: Jens Axboe <[email protected]>

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Date: Mon, 23 Jan 2023 15:03:34 +0300
From: Dan Carpenter <[email protected]>
To: [email protected], Ammar Faizi <[email protected]>, GNU/Weeb Mailing List <[email protected]>
Cc: [email protected], [email protected]
Subject: [ammarfaizi2-block:google/android/kernel/common/upstream-f2fs-stable-linux-5.15.y 115/361] fs/f2fs/data.c:996 f2fs_grab_read_bio() warn: variable dereferenced before check 'bio' (see line 995)
Message-ID: <Y853lht6nq1emVj6@kadam>
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tree:   https://github.com/ammarfaizi2/linux-block google/android/kernel/common/upstream-f2fs-stable-linux-5.15.y
head:   4bf3e7f429f64b802942c685cf37b02a546a25e5
commit: e8e3f1a12d05d0aef2c819664890b540dfb055af [115/361] f2fs: don't pass a bio to f2fs_target_device
config: arm64-randconfig-m041-20230115 (https://download.01.org/0day-ci/archive/20230122/[email protected]/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Reported-by: Dan Carpenter <[email protected]>

New smatch warnings:
fs/f2fs/data.c:996 f2fs_grab_read_bio() warn: variable dereferenced before check 'bio' (see line 995)

vim +/bio +996 fs/f2fs/data.c

13ba41e346170e Jaegeuk Kim             2017-09-06   982  static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
95ae251fe82838 Eric Biggers            2019-07-22   983  				      unsigned nr_pages, unsigned op_flag,
7f59b277f79e8a Eric Biggers            2021-01-04   984  				      pgoff_t first_idx, bool for_write)
13ba41e346170e Jaegeuk Kim             2017-09-06   985  {
13ba41e346170e Jaegeuk Kim             2017-09-06   986  	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
13ba41e346170e Jaegeuk Kim             2017-09-06   987  	struct bio *bio;
a4b6817625e71d Daeho Jeong             2021-08-20   988  	struct bio_post_read_ctx *ctx = NULL;
6dbb17961f46b2 Eric Biggers            2018-04-18   989  	unsigned int post_read_steps = 0;
e8e3f1a12d05d0 Christoph Hellwig       2022-02-28   990  	sector_t sector;
e8e3f1a12d05d0 Christoph Hellwig       2022-02-28   991  	struct block_device *bdev = f2fs_target_device(sbi, blkaddr, &sector);
13ba41e346170e Jaegeuk Kim             2017-09-06   992
67883ade7a98a7 Christoph Hellwig       2021-01-26   993  	bio = bio_alloc_bioset(for_write ? GFP_NOIO : GFP_KERNEL,
5f7136db829960 Matthew Wilcox (Oracle  2021-01-29   994) 			       bio_max_segs(nr_pages), &f2fs_bioset);
e8e3f1a12d05d0 Christoph Hellwig       2022-02-28  @995  	bio_set_dev(bio, bdev);
                                                                             ^^^
Dereferenced inside function

6dbb17961f46b2 Eric Biggers            2018-04-18  @996  	if (!bio)
                                                                     ^^^^
Checked too late

13ba41e346170e Jaegeuk Kim             2017-09-06   997  		return ERR_PTR(-ENOMEM);
e8e3f1a12d05d0 Christoph Hellwig       2022-02-28   998  	bio->bi_iter.bi_sector = sector;
27aacd28ea3b89 Satya Tangirala         2020-07-02   999  	f2fs_set_bio_crypt_ctx(bio, inode, first_idx, NULL, GFP_NOFS);
13ba41e346170e Jaegeuk Kim             2017-09-06  1000  	bio->bi_end_io = f2fs_read_end_io;
e2e59414aae2c8 Jaegeuk Kim             2018-06-21  1001  	bio_set_op_attrs(bio, REQ_OP_READ, op_flag);
13ba41e346170e Jaegeuk Kim             2017-09-06  1002
27aacd28ea3b89 Satya Tangirala         2020-07-02  1003  	if (fscrypt_inode_uses_fs_layer_crypto(inode))
7f59b277f79e8a Eric Biggers            2021-01-04  1004  		post_read_steps |= STEP_DECRYPT;
7f59b277f79e8a Eric Biggers            2021-01-04  1005

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

next prev parent reply	other threads:[~2023-01-23 12:24 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-23 12:03 [ammarfaizi2-block:google/android/kernel/common/upstream-f2fs-stable-linux-5.15.y 115/361] fs/f2fs/data.c:996 f2fs_grab_read_bio() warn: variable dereferenced before check 'bio' (see line 995) Dan Carpenter
2023-01-23 12:22 ` Ammar Faizi
2023-01-23 12:24 ` Ammar Faizi [this message]
2023-01-23 12:37   ` Fwd: " Dan Carpenter

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