The kzalloc here was being used without checking the return - if the kzalloc fails return VCHIQ_ERROR. The call-site of vchiq_platform_init_state() vchiq_init_state() was not responding to an allocation failure so checks for != VCHIQ_SUCCESS and pass VCHIQ_ERROR up to vchiq_platform_init() which then will fail with -EINVAL. Signed-off-by: Nicholas Mc Guire <hofrat@xxxxxxxxx> --- Problem located with experimental coccinelle script Patch was compile-tested with: bcm2835_defconfig (implies BCM2835_VCHIQ=m) (with sparse warning: CHECK drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c:410:29: warning: incorrect type in argument 1 (different address spaces) drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c:410:29: expected void const *x drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c:410:29: got char [noderef] <asn:1> *buf drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c:416:63: warning: incorrect type in argument 1 (different address spaces) drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c:416:63: expected void const *addr drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c:416:63: got char [noderef] <asn:1> * CC [M] drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.o Q: should this buf have been remapped to user space e.g. remap_vmalloc_range ? Patch is against 5.1-rc5 (localversion next is 20190417) drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c | 3 +++ drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c | 2 ++ 2 files changed, 5 insertions(+) diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c index 31eb7d5..a9a2291 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c @@ -179,6 +179,9 @@ vchiq_platform_init_state(struct vchiq_state *state) struct vchiq_2835_state *platform_state; state->platform_state = kzalloc(sizeof(*platform_state), GFP_KERNEL); + if (!state->platform_state) + return VCHIQ_ERROR; + platform_state = (struct vchiq_2835_state *)state->platform_state; platform_state->inited = 1; diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c index 6057a90..92e6221 100644 --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c @@ -2209,6 +2209,8 @@ vchiq_init_state(struct vchiq_state *state, struct vchiq_slot_zero *slot_zero) local->debug[DEBUG_ENTRIES] = DEBUG_MAX; status = vchiq_platform_init_state(state); + if (status != VCHIQ_SUCCES) + return VCHIQ_ERROR; /* bring up slot handler thread -- 2.1.4 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
