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KEYS: fix parsing invalid pkey info string 

We need to check the return value of match_token() for Opt_err before
doing anything with it.

[ Not only did the old "-1" value for Opt_err cause problems for the
  __test_and_set_bit(), as fixed in commit 94c13f66e1 ("security:
  don't use a negative Opt_err token index"), but accessing
  "args[0].from" is invalid for the Opt_err case, as pointed out by Eric
  later.  - Linus ]

Reported-by: syzbot+a22e0dc07567662c50bc@syzkaller.appspotmail.com
Fixes: 00d60fd3b9 ("KEYS: Provide keyctls to drive the new key type ops for asymmetric keys [ver #2]")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Cc: stable@kernel.org # 4.20
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Biggers 2018-11-03 10:30:35 -07:00 committed by Linus Torvalds
parent e1ef035d27
commit 57b0e31453
1 changed files with 2 additions and 0 deletions
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2
security/keys/keyctl_pkey.c
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@ -50,6 +50,8 @@ static int keyctl_pkey_params_parse(struct kernel_pkey_params *params)
if (*p == '\0' || *p == ' ' || *p == '\t')
continue;
token = match_token(p, param_keys, args);
if (token == Opt_err)
return -EINVAL;
if (__test_and_set_bit(token, &token_mask))
return -EINVAL;
q = args[0].from;