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commit 57b0e31453209d746c99e513d80b3d0c44a80891
parent e1ef035d272ef4dbfdda98e58699698305138856
Author: Eric Biggers <ebiggers@google.com>
Date:   Sat,  3 Nov 2018 10:30:35 -0700

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 94c13f66e13c ("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: 00d60fd3b932 ("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>

Msecurity/keys/keyctl_pkey.c | 2++
1 file changed, 2 insertions(+), 0 deletions(-)

diff --git a/security/keys/keyctl_pkey.c b/security/keys/keyctl_pkey.c @@ -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;