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staging: erofs: fix unexpected out-of-bound data access 

Unexpected out-of-bound data will be read in erofs_read_raw_page
after commit 07173c3ec2 ("block: enable multipage bvecs") since
one iovec could have multiple pages.

Let's fix as what Ming's pointed out in the previous email [1].

[1] https://lore.kernel.org/lkml/20190411080953.GE421@ming.t460p/

Suggested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Fixes: 07173c3ec2 ("block: enable multipage bvecs")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2019-04-12 17:53:14 +08:00 committed by Greg Kroah-Hartman
parent 663d294b47
commit f4e97f5d4c
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/erofs/data.c
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@ -298,7 +298,7 @@ static inline struct bio *erofs_read_raw_page(struct bio *bio,
*last_block = current_block; *last_block = current_block;
/* shift in advance in case of it followed by too many gaps */ /* shift in advance in case of it followed by too many gaps */
if (unlikely(bio->bi_vcnt >= bio->bi_max_vecs)) { if (bio->bi_iter.bi_size >= bio->bi_max_vecs * PAGE_SIZE) {
/* err should reassign to 0 after submitting */ /* err should reassign to 0 after submitting */
err = 0; err = 0;
goto submit_bio_out; goto submit_bio_out;