commit ee45197c807895e156b2be0abcaebdfc116487c8 upstream.
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: 3883a79abd02 ("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 [ Gao Xiang: Manually backport to v5.3.y stable. ] Signed-off-by: Gao Xiang gaoxiang25@huawei.com --- drivers/staging/erofs/unzip_vle.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c index f0dab81ff816..438d78db69cf 100644 --- a/drivers/staging/erofs/unzip_vle.c +++ b/drivers/staging/erofs/unzip_vle.c @@ -1498,19 +1498,18 @@ static int z_erofs_vle_normalaccess_readpage(struct file *file, err = z_erofs_do_read_page(&f, page, &pagepool); (void)z_erofs_vle_work_iter_end(&f.builder);
- if (err) { + /* if some compressed cluster ready, need submit them anyway */ + z_erofs_submit_and_unzip(&f, &pagepool, true); + + if (err) errln("%s, failed to read, err [%d]", __func__, err); - goto out; - }
- z_erofs_submit_and_unzip(&f, &pagepool, true); -out: if (f.map.mpage) put_page(f.map.mpage);
/* clean up the remaining free pages */ put_pages_list(&pagepool); - return 0; + return err; }
static int z_erofs_vle_normalaccess_readpages(struct file *filp,