laforge has submitted this change. ( https://gerrit.osmocom.org/c/osmo-remsim/+/42231?usp=email )

Change subject: remsim-bankd: Don't pass on illegal TPDUs of illegal length ......................................................................

remsim-bankd: Don't pass on illegal TPDUs of illegal length

TPDUs with length < 5 bytes or > 260 bytes are illegal in T=0. It doesn't make sense to send them to pcsc-lite, triggering bugs in either pcsc-lite or the CCID firmware down the road. Let's filter them.

Change-Id: I5c9f1143b85470234acd2e2ffe3e0cf72bd2ae43 --- M src/bankd/bankd_main.c 1 file changed, 6 insertions(+), 0 deletions(-)

Approvals: Jenkins Builder: Verified lynxis lazus: Looks good to me, approved

diff --git a/src/bankd/bankd_main.c b/src/bankd/bankd_main.c index 6e47376..1adc34c 100644 --- a/src/bankd/bankd_main.c +++ b/src/bankd/bankd_main.c @@ -820,6 +820,12 @@ return -106; }

+ if (mdm2sim->data.size < 5 || mdm2sim->data.size > 260) { + LOGW(worker, "Illegal TPDU length %u octets, not passing to driver/reader\n", + mdm2sim->data.size); + return -107; + } + rc = worker->ops->transceive(worker, mdm2sim->data.buf, mdm2sim->data.size, rx_buf, &rx_buf_len); if (rc < 0)