diff options
| author | Gao Xiang <gaoxiang25@huawei.com> | 2019-10-09 18:12:39 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-11 18:21:41 +0200 |
| commit | 3dab5ba6d7ae8ab5dfcaa61127d92cf07ceca016 (patch) | |
| tree | 1c99b873b8cb2fa85d0b1fb09e33f94a5c65b8e6 | |
| parent | 8b4341f9b80bb8a7aefedce50b0305696083a830 (diff) | |
staging: erofs: detect potential multiref due to corrupted images
commit e12a0ce2fa69798194f3a8628baf6edfbd5c548f upstream.
As reported by erofs-utils fuzzer, currently, multiref
(ondisk deduplication) hasn't been supported for now,
we should forbid it properly.
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/20190821140152.229648-1-gaoxiang25@huawei.com
[ Gao Xiang: Since earlier kernels don't define EFSCORRUPTED,
let's use EIO instead. ]
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/erofs/unzip_vle.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/staging/erofs/unzip_vle.c b/drivers/staging/erofs/unzip_vle.c index 7bd406f34f8b..0f1558c6747e 100644 --- a/drivers/staging/erofs/unzip_vle.c +++ b/drivers/staging/erofs/unzip_vle.c @@ -857,6 +857,7 @@ repeat: for (i = 0; i < nr_pages; ++i) pages[i] = NULL; + err = 0; z_erofs_pagevec_ctor_init(&ctor, Z_EROFS_VLE_INLINE_PAGEVECS, work->pagevec, 0); @@ -878,8 +879,17 @@ repeat: pagenr = z_erofs_onlinepage_index(page); DBG_BUGON(pagenr >= nr_pages); - DBG_BUGON(pages[pagenr]); + /* + * currently EROFS doesn't support multiref(dedup), + * so here erroring out one multiref page. + */ + if (pages[pagenr]) { + DBG_BUGON(1); + SetPageError(pages[pagenr]); + z_erofs_onlinepage_endio(pages[pagenr]); + err = -EIO; + } pages[pagenr] = page; } sparsemem_pages = i; @@ -889,7 +899,6 @@ repeat: overlapped = false; compressed_pages = grp->compressed_pages; - err = 0; for (i = 0; i < clusterpages; ++i) { unsigned pagenr; @@ -915,7 +924,12 @@ repeat: pagenr = z_erofs_onlinepage_index(page); DBG_BUGON(pagenr >= nr_pages); - DBG_BUGON(pages[pagenr]); + if (pages[pagenr]) { + DBG_BUGON(1); + SetPageError(pages[pagenr]); + z_erofs_onlinepage_endio(pages[pagenr]); + err = -EIO; + } ++sparsemem_pages; pages[pagenr] = page; |