Ticket History #8933: Fix input length checking in SPNEGO DER decoding

Fix input length checking in SPNEGO DER decoding

In get_mech_set(), check the length before reading the first byte, and
decrease the length by the tag byte when reading and verifying the
sequence length.

In get_req_flags(), check the length before reading the first byte,
and check the context tag length after decoding it.

(cherry picked from commit 64f4b75a22212681ca293f8f09ddd24b0244d5b4)

https://github.com/krb5/krb5/commit/9e65436cb03d6f0ec93c6fdef68af8ed6077e997
Author: Greg Hudson <ghudson@mit.edu>
Commit: 9e65436cb03d6f0ec93c6fdef68af8ed6077e997
Branch: krb5-1.17
src/lib/gssapi/spnego/spnego_mech.c | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)

Fix input length checking in SPNEGO DER decoding

In get_mech_set(), check the length before reading the first byte, and
decrease the length by the tag byte when reading and verifying the
sequence length.

In get_req_flags(), check the length before reading the first byte,
and check the context tag length after decoding it.

(cherry picked from commit 64f4b75a22212681ca293f8f09ddd24b0244d5b4)

https://github.com/krb5/krb5/commit/8c9443436739ef640062f619aff55f4413a946f0
Author: Greg Hudson <ghudson@mit.edu>
Commit: 8c9443436739ef640062f619aff55f4413a946f0
Branch: krb5-1.18
src/lib/gssapi/spnego/spnego_mech.c | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)