linux-kernel - [PATCH 20/29] ubifs: Relax checks in ubifs_validate

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Message-Id: <1479072072-6844-21-git-send-email-richard@nod.at>
Date:   Sun, 13 Nov 2016 22:21:03 +0100
From:   Richard Weinberger <richard@....at>
To:     linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        dedekind1@...il.com, adrian.hunter@...el.com, tytso@....edu,
        jaegeuk@...nel.org, david@...ma-star.at, wd@...x.de,
        sbabic@...x.de, dengler@...utronix.de, ebiggers@...gle.com,
        mhalcrow@...gle.com, hch@...radead.org,
        Richard Weinberger <richard@....at>
Subject: [PATCH 20/29] ubifs: Relax checks in ubifs_validate_entry()

With encrypted filenames we store raw binary data, doing
string tests is no longer possible.

Signed-off-by: Richard Weinberger <richard@....at>
---
 fs/ubifs/replay.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ubifs/replay.c b/fs/ubifs/replay.c
index fb0f44cd1e28..026e853d31a7 100644
--- a/fs/ubifs/replay.c
+++ b/fs/ubifs/replay.c
@@ -456,7 +456,7 @@ int ubifs_validate_entry(struct ubifs_info *c,
 	if (le32_to_cpu(dent->ch.len) != nlen + UBIFS_DENT_NODE_SZ + 1 ||
 	    dent->type >= UBIFS_ITYPES_CNT ||
 	    nlen > UBIFS_MAX_NLEN || dent->name[nlen] != 0 ||
-	    strnlen(dent->name, nlen) != nlen ||
+	    (key_type == UBIFS_XENT_KEY && strnlen(dent->name, nlen) != nlen) ||
 	    le64_to_cpu(dent->inum) > MAX_INUM) {
 		ubifs_err(c, "bad %s node", key_type == UBIFS_DENT_KEY ?
 			  "directory entry" : "extended attribute entry");
-- 
2.7.3