linux-kernel - [PATCH 4.16 61/81] commoncap: Handle memory allocation failure.

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Date:   Fri, 27 Apr 2018 15:59:03 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        syzbot <syzbot+9369930ca44f29e60e2d@...kaller.appspotmail.com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        James Morris <james.morris@...rosoft.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 4.16 61/81] commoncap: Handle memory allocation failure.

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>

commit 1f5781725dcbb026438e77091c91a94f678c3522 upstream.

syzbot is reporting NULL pointer dereference at xattr_getsecurity() [1],
for cap_inode_getsecurity() is returning sizeof(struct vfs_cap_data) when
memory allocation failed. Return -ENOMEM if memory allocation failed.

[1] https://syzkaller.appspot.com/bug?id=a55ba438506fe68649a5f50d2d82d56b365e0107

Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Fixes: 8db6c34f1dbc8e06 ("Introduce v3 namespaced file capabilities")
Reported-by: syzbot <syzbot+9369930ca44f29e60e2d@...kaller.appspotmail.com>
Cc: stable <stable@...r.kernel.org> # 4.14+
Acked-by: Serge E. Hallyn <serge@...lyn.com>
Acked-by: James Morris <james.morris@...rosoft.com>
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 security/commoncap.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -449,6 +449,8 @@ int cap_inode_getsecurity(struct inode *
 				magic |= VFS_CAP_FLAGS_EFFECTIVE;
 			memcpy(&cap->data, &nscap->data, sizeof(__le32) * 2 * VFS_CAP_U32);
 			cap->magic_etc = cpu_to_le32(magic);
+		} else {
+			size = -ENOMEM;
 		}
 	}
 	kfree(tmpbuf);