| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 017/191] cifs: Return the error from crypt_message when enc/dec key not found. | Date | Tue, 27 Oct 2020 14:47:52 +0100 |
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From: Shyam Prasad N <sprasad@microsoft.com>
commit 0bd294b55a5de442370c29fa53bab17aef3ff318 upstream.
In crypt_message, when smb2_get_enc_key returns error, we need to return the error back to the caller. If not, we end up processing the message further, causing a kernel oops due to unwarranted access of memory.
Call Trace: smb3_receive_transform+0x120/0x870 [cifs] cifs_demultiplex_thread+0xb53/0xc20 [cifs] ? cifs_handle_standard+0x190/0x190 [cifs] kthread+0x116/0x130 ? kthread_park+0x80/0x80 ret_from_fork+0x1f/0x30
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> CC: Stable <stable@vger.kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/cifs/smb2ops.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -2305,7 +2305,7 @@ crypt_message(struct TCP_Server_Info *se if (rc) { cifs_dbg(VFS, "%s: Could not get %scryption key\n", __func__, enc ? "en" : "de"); - return 0; + return rc; } rc = smb3_crypto_aead_allocate(server);
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