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

Browse Source 
* g10/build-packet.c (do_secret_key): Check for NULL return from
gcry_mpi_get_opaque.
* g10/keyid.c (hash_public_key): Ditto.
--

This is a backport of 76c8122adf from
master to the STABLE-BRANCH-1-4

On the STABLE-BRANCH-1-4, we may also want to patch g10/seckey-cert.c,
but that has not been done in this patch.

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
[dkg: rebased to STABLE-BRANCH-1-4]
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
This commit is contained in:
Daniel Kahn Gillmor 2015-02-21 23:10:37 -05:00 committed by Werner Koch
parent a35ed8af41
commit 6f032181ba
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
2 changed files with 10 additions and 4 deletions
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6
g10/build-packet.c
View File

@ -356,7 +356,8 @@ do_secret_key( IOBUF out, int ctb, PKT_secret_key *sk )
assert( mpi_is_opaque( sk->skey[npkey] ) );
p = mpi_get_opaque( sk->skey[npkey], &ndata );
iobuf_write(a, p, ndata );
if (p)
iobuf_write(a, p, ndata );
}
else if( sk->is_protected ) {
/* The secret key is protected te old v4 way. */
@ -366,7 +367,8 @@ do_secret_key( IOBUF out, int ctb, PKT_secret_key *sk )
assert (mpi_is_opaque (sk->skey[i]));
p = mpi_get_opaque (sk->skey[i], &ndata);
iobuf_write (a, p, ndata);
if (p)
iobuf_write (a, p, ndata);
}
write_16(a, sk->csum );
}

8
g10/keyid.c
View File

@ -112,13 +112,17 @@ hash_public_key( MD_HANDLE md, PKT_public_key *pk )
md_putc( md, pk->pubkey_algo );
if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
md_write(md,pp[0],nn[0]);
{
if (pp[0])
md_write(md,pp[0],nn[0]);
}
else
for(i=0; i < npkey; i++ )
{
md_putc( md, nb[i]>>8);
md_putc( md, nb[i] );
md_write( md, pp[i], nn[i] );
if (pp[i])
md_write( md, pp[i], nn[i] );
xfree(pp[i]);
}
}