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Message-ID: <202301131759.qq5Cubxn-lkp@intel.com>
Date: Fri, 13 Jan 2023 12:26:26 +0300
From: Dan Carpenter <error27@...il.com>
To: oe-kbuild@...ts.linux.dev, Yangtao Li <frank.li@...o.com>,
jaegeuk@...nel.org, chao@...nel.org
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, Yangtao Li <frank.li@...o.com>
Subject: Re: [PATCH] f2fs: use iostat_lat_type directly as a parameter in the
iostat_update_and_unbind_ctx()
Hi Yangtao,
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Yangtao-Li/f2fs-use-iostat_lat_type-directly-as-a-parameter-in-the-iostat_update_and_unbind_ctx/20230105-122414
base: https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev-test
patch link: https://lore.kernel.org/r/20230105042240.24738-1-frank.li%40vivo.com
patch subject: [PATCH] f2fs: use iostat_lat_type directly as a parameter in the iostat_update_and_unbind_ctx()
config: alpha-randconfig-m041-20230110
compiler: alpha-linux-gcc (GCC) 12.1.0
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Reported-by: Dan Carpenter <error27@...il.com>
New smatch warnings:
fs/f2fs/iostat.c:228 __update_iostat_latency() error: buffer overflow 'io_lat->sum_lat[type]' 3 <= 3
fs/f2fs/iostat.c:229 __update_iostat_latency() error: buffer overflow 'io_lat->bio_cnt[type]' 3 <= 3
fs/f2fs/iostat.c:230 __update_iostat_latency() error: buffer overflow 'io_lat->peak_lat[type]' 3 <= 3
Old smatch warnings:
fs/f2fs/iostat.c:231 __update_iostat_latency() error: buffer overflow 'io_lat->peak_lat[type]' 3 <= 3
vim +228 fs/f2fs/iostat.c
a4b6817625e71d Daeho Jeong 2021-08-20 211 static inline void __update_iostat_latency(struct bio_iostat_ctx *iostat_ctx,
2804a18e00dbd6 Yangtao Li 2023-01-05 212 enum iostat_lat_type type)
a4b6817625e71d Daeho Jeong 2021-08-20 213 {
a4b6817625e71d Daeho Jeong 2021-08-20 214 unsigned long ts_diff;
2804a18e00dbd6 Yangtao Li 2023-01-05 215 unsigned int page_type = iostat_ctx->type;
a4b6817625e71d Daeho Jeong 2021-08-20 216 struct f2fs_sb_info *sbi = iostat_ctx->sbi;
a4b6817625e71d Daeho Jeong 2021-08-20 217 struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
61803e984307c7 Daeho Jeong 2022-06-10 218 unsigned long flags;
a4b6817625e71d Daeho Jeong 2021-08-20 219
a4b6817625e71d Daeho Jeong 2021-08-20 220 if (!sbi->iostat_enable)
a4b6817625e71d Daeho Jeong 2021-08-20 221 return;
a4b6817625e71d Daeho Jeong 2021-08-20 222
a4b6817625e71d Daeho Jeong 2021-08-20 223 ts_diff = jiffies - iostat_ctx->submit_ts;
2804a18e00dbd6 Yangtao Li 2023-01-05 224 if (page_type >= META_FLUSH)
^^^^^^^^^^
2804a18e00dbd6 Yangtao Li 2023-01-05 225 page_type = META;
a4b6817625e71d Daeho Jeong 2021-08-20 226
61803e984307c7 Daeho Jeong 2022-06-10 227 spin_lock_irqsave(&sbi->iostat_lat_lock, flags);
2804a18e00dbd6 Yangtao Li 2023-01-05 @228 io_lat->sum_lat[type][page_type] += ts_diff;
^^^^^^^^^
Mixup between META_FLUSH and NR_PAGE_TYPE leads to memory corruption.
2804a18e00dbd6 Yangtao Li 2023-01-05 @229 io_lat->bio_cnt[type][page_type]++;
2804a18e00dbd6 Yangtao Li 2023-01-05 @230 if (ts_diff > io_lat->peak_lat[type][page_type])
2804a18e00dbd6 Yangtao Li 2023-01-05 231 io_lat->peak_lat[type][page_type] = ts_diff;
61803e984307c7 Daeho Jeong 2022-06-10 232 spin_unlock_irqrestore(&sbi->iostat_lat_lock, flags);
a4b6817625e71d Daeho Jeong 2021-08-20 233 }
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
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