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staging: erofs: some compressed cluster should be submitted for corrupted images

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As reported by erofs_utils fuzzer, a logical page can belong
to at most 2 compressed clusters, if one compressed cluster
is corrupted, but the other has been ready in submitting chain.

The chain needs to submit anyway in order to keep the page
working properly (page unlocked with PG_error set, PG_uptodate
not set).

Let's fix it now.

Fixes: 3883a79abd ("staging: erofs: introduce VLE decompression support")
Cc: <stable@vger.kernel.org> # 4.19+
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Link: https://lore.kernel.org/r/20190819103426.87579-2-gaoxiang25@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang 2019-08-19 18:34:21 +08:00 committed by Greg Kroah-Hartman
parent acb383f1dc
commit ee45197c80
1 changed files with 6 additions and 7 deletions
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13
drivers/staging/erofs/zdata.c
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@ -1307,19 +1307,18 @@ static int z_erofs_vle_normalaccess_readpage(struct file *file,
err = z_erofs_do_read_page(&f, page, &pagepool);
(void)z_erofs_collector_end(&f.clt);
if (err) {
errln("%s, failed to read, err [%d]", __func__, err);
goto out;
}
/* if some compressed cluster ready, need submit them anyway */
z_erofs_submit_and_unzip(inode->i_sb, &f.clt, &pagepool, true);
out:
if (err)
errln("%s, failed to read, err [%d]", __func__, err);
if (f.map.mpage)
put_page(f.map.mpage);
/* clean up the remaining free pages */
put_pages_list(&pagepool);
return 0;
return err;
}
static bool should_decompress_synchronously(struct erofs_sb_info *sbi,