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SubjectRe: [PATCH v3 1/2] f2fs: fix to avoid potential memory corruption in __update_iostat_latency()
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On 2023/1/21 0:16, Yangtao Li wrote:
> Add iotype sanity check to avoid potential memory corruption.
> This is to fix the compile error below:
>
> fs/f2fs/iostat.c:231 __update_iostat_latency() error: buffer overflow
> 'io_lat->peak_lat[type]' 3 <= 3
>
> vim +228 fs/f2fs/iostat.c
>
> 211 static inline void __update_iostat_latency(struct bio_iostat_ctx
> *iostat_ctx,
> 212 enum iostat_lat_type type)
> 213 {
> 214 unsigned long ts_diff;
> 215 unsigned int page_type = iostat_ctx->type;
> 216 struct f2fs_sb_info *sbi = iostat_ctx->sbi;
> 217 struct iostat_lat_info *io_lat = sbi->iostat_io_lat;
> 218 unsigned long flags;
> 219
> 220 if (!sbi->iostat_enable)
> 221 return;
> 222
> 223 ts_diff = jiffies - iostat_ctx->submit_ts;
> 224 if (page_type >= META_FLUSH)
> ^^^^^^^^^^
>
> 225 page_type = META;
> 226
> 227 spin_lock_irqsave(&sbi->iostat_lat_lock, flags);
> @228 io_lat->sum_lat[type][page_type] += ts_diff;
> ^^^^^^^^^
> Mixup between META_FLUSH and NR_PAGE_TYPE leads to memory corruption.
>
> Fixes: a4b6817625e7 ("f2fs: introduce periodic iostat io latency traces")
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <error27@gmail.com>
> Suggested-by: Chao Yu <chao@kernel.org>
> Suggested-by: Jaegeuk Kim <jaegeuk@kernel.org>
> Signed-off-by: Yangtao Li <frank.li@vivo.com>

Reviewed-by: Chao Yu <chao@kernel.org>

Thanks,

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