V4L/DVB: stv0900: dereference of state->internal in fe_stv0900_error stv0900_init_internal()

state->internal allocation may fail as well as the allocation of
stv0900_first_inode or new_node->next_inode in append_internal().

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/stv0900_core.c b/drivers/media/dvb/frontends/stv0900_core.c
index 74791d550dc7..e5791b2b913b 100644
--- a/drivers/media/dvb/frontends/stv0900_core.c
+++ b/drivers/media/dvb/frontends/stv0900_core.c
@@ -1384,7 +1384,14 @@ static enum fe_stv0900_error stv0900_init_internal(struct dvb_frontend *fe,
         } else {
                 state->internal = kmalloc(sizeof(struct stv0900_internal),
                                                                 GFP_KERNEL);
+                if (state->internal == NULL)
+                        return STV0900_INVALID_HANDLE;
                 temp_int = append_internal(state->internal);
+                if (temp_int == NULL) {
+                        kfree(state->internal);
+                        state->internal = NULL;
+                        return STV0900_INVALID_HANDLE;
+                }
                 state->internal->dmds_used = 1;
                 state->internal->i2c_adap = state->i2c_adap;
                 state->internal->i2c_addr = state->config->demod_address;