gsm_a_gm: fix potential buffer overrun (read)

When the string "str" is empty, "str+1" is invalid. This function can be
called from functions using SET_ELEM_VARS in packet-gsm_a_common.c which
appear to check the length first, but packet-etsi_card_app_toolkit.c and
packet-camel.c do not. Err on the safe side and do not add the item.

Change-Id: I6bd559593bb10ff0b8bf08a48d828613e3d8ccf5
Link: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4311
Reviewed-on: https://code.wireshark.org/review/27470
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>
Reviewed-by: Anders Broman <a.broman58@gmail.com>

0 files changed, 0 insertions, 0 deletions