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Commit fc833c2a authored by JackieLiu's avatar JackieLiu Committed by Shaohua Li
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md/raid5-cache: use ring add to prevent overflow 



'write_pos' must be protected with 'r5l_ring_add', or it may overflow

Signed-off-by: default avatarJackieLiu <liuyun01@kylinos.cn>
Reviewed-by: default avatarSong Liu <songliubraving@fb.com>
Signed-off-by: default avatarShaohua Li <shli@fb.com>
parent 9b69173e

drivers/md/raid5-cache.c

+1 −1
Original line number Diff line number Diff line
@@ -2084,7 +2084,7 @@ r5c_recovery_rewrite_data_only_stripes(struct r5l_log *log, 
						     ctx->pos, ctx->seq);

		mb = page_address(page);

		offset = le32_to_cpu(mb->meta_size);

		write_pos = ctx->pos + BLOCK_SECTORS;

		write_pos = r5l_ring_add(log, ctx->pos, BLOCK_SECTORS);



		for (i = sh->disks; i--; ) {

			struct r5dev *dev = &sh->dev[i];