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CIFS: Fix BUG() in calc_seckey()

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Andy Lutromirski's new virtually mapped kernel stack allocations moves
kernel stacks the vmalloc area. This triggers the bug
 kernel BUG at ./include/linux/scatterlist.h:140!
at calc_seckey()->sg_init()

Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
This commit is contained in:
Sachin Prabhu 2016-10-17 16:40:22 -04:00 committed by Steve French
parent 88abd8249e
commit 5f4b55699a
1 changed files with 8 additions and 3 deletions
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11
fs/cifs/cifsencrypt.c
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@ -808,7 +808,11 @@ calc_seckey(struct cifs_ses *ses)
struct crypto_skcipher *tfm_arc4;
struct scatterlist sgin, sgout;
struct skcipher_request *req;
unsigned char sec_key[CIFS_SESS_KEY_SIZE]; /* a nonce */
unsigned char *sec_key;
sec_key = kmalloc(CIFS_SESS_KEY_SIZE, GFP_KERNEL);
if (sec_key == NULL)
return -ENOMEM;
get_random_bytes(sec_key, CIFS_SESS_KEY_SIZE);
@ -816,7 +820,7 @@ calc_seckey(struct cifs_ses *ses)
if (IS_ERR(tfm_arc4)) {
rc = PTR_ERR(tfm_arc4);
cifs_dbg(VFS, "could not allocate crypto API arc4\n");
return rc;
goto out;
}
rc = crypto_skcipher_setkey(tfm_arc4, ses->auth_key.response,
@ -854,7 +858,8 @@ calc_seckey(struct cifs_ses *ses)
out_free_cipher:
crypto_free_skcipher(tfm_arc4);
out:
kfree(sec_key);
return rc;
}