diff options
| author | Andy Lutomirski <luto@kernel.org> | 2016-12-13 18:50:13 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-19 20:18:01 +0100 |
| commit | 88d3670a1de4246cd40dfacdc21289b313caf5ed (patch) | |
| tree | 7a137776da737663fdefe6002a0a16957315004d /drivers/usb/wusbcore | |
| parent | 99ff99b830c1d70d0c6ec50c64588d9bd8bd5d05 (diff) | |
wusbcore: Fix one more crypto-on-the-stack bug
commit 620f1a632ebcc9811c2f8009ba52297c7006f805 upstream.
The driver put a constant buffer of all zeros on the stack and
pointed a scatterlist entry at it. This doesn't work with virtual
stacks. Use ZERO_PAGE instead.
Reported-by: Eric Biggers <ebiggers3@gmail.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/wusbcore')
| -rw-r--r-- | drivers/usb/wusbcore/crypto.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/usb/wusbcore/crypto.c b/drivers/usb/wusbcore/crypto.c index 79451f7ef1b7..062c205f0046 100644 --- a/drivers/usb/wusbcore/crypto.c +++ b/drivers/usb/wusbcore/crypto.c @@ -216,7 +216,6 @@ static int wusb_ccm_mac(struct crypto_skcipher *tfm_cbc, struct scatterlist sg[4], sg_dst; void *dst_buf; size_t dst_size; - const u8 bzero[16] = { 0 }; u8 iv[crypto_skcipher_ivsize(tfm_cbc)]; size_t zero_padding; @@ -261,7 +260,7 @@ static int wusb_ccm_mac(struct crypto_skcipher *tfm_cbc, sg_set_buf(&sg[1], &scratch->b1, sizeof(scratch->b1)); sg_set_buf(&sg[2], b, blen); /* 0 if well behaved :) */ - sg_set_buf(&sg[3], bzero, zero_padding); + sg_set_page(&sg[3], ZERO_PAGE(0), zero_padding, 0); sg_init_one(&sg_dst, dst_buf, dst_size); skcipher_request_set_tfm(req, tfm_cbc); |