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gpg: Fix segv due to NULL value stored as opaque MPI.

* g10/build-packet.c (gpg_mpi_write): Check for NULL return from
gcry_mpi_get_opaque.
(gpg_mpi_write_nohdr, do_key): Ditto.
* g10/keyid.c (hash_public_key): Ditto.
--

This fix extends commmit 0835d2f44e.

  gpg2 --export --no-default-keyring --keyring TESTDATA

With TESTDATA being below after unpacking.

-----BEGIN PGP ARMORED FILE-----

mBMEhdkMmS8BcX8F//8F5voEhQAQmBMEnAAAZwAAo4D/f/8EhQAAAIAEnP8EhQAQ
iBMEnP8AAAAABf8jIID///8EhQYQmBMEnIUAEIgTBKT/AAAAAAUAACCA/f//BIUA
EJgTBJx/AP8ABPPzBJx/AP8ABPPz
=2yE0
-----END PGP ARMORED FILE-----

Reported-by: Jodie Cunningham
Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2015-02-19 16:29:58 +01:00
parent 07a71da479
commit 76c8122adf
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
2 changed files with 18 additions and 10 deletions

View file

@ -171,7 +171,7 @@ gpg_mpi_write (iobuf_t out, gcry_mpi_t a)
lenhdr[0] = nbits >> 8;
lenhdr[1] = nbits;
rc = iobuf_write (out, lenhdr, 2);
if (!rc)
if (!rc && p)
rc = iobuf_write (out, p, (nbits+7)/8);
}
else
@ -209,7 +209,7 @@ gpg_mpi_write_nohdr (iobuf_t out, gcry_mpi_t a)
const void *p;
p = gcry_mpi_get_opaque (a, &nbits);
rc = iobuf_write (out, p, (nbits+7)/8);
rc = p ? iobuf_write (out, p, (nbits+7)/8) : 0;
}
else
rc = gpg_error (GPG_ERR_BAD_MPI);
@ -393,7 +393,8 @@ do_key (iobuf_t out, int ctb, PKT_public_key *pk)
assert (gcry_mpi_get_flag (pk->pkey[npkey], GCRYMPI_FLAG_OPAQUE));
p = gcry_mpi_get_opaque (pk->pkey[npkey], &ndatabits);
iobuf_write (a, p, (ndatabits+7)/8 );
if (p)
iobuf_write (a, p, (ndatabits+7)/8 );
}
else
{