policy_define.c: don't free memory returned from queue_head()
Unlike queue_remove(), queue_head() does not modify the queue, but
rather, returns a pointer to an element within the queue. Freeing the
memory associated with a value returned from that function corrupts
subsequent users of the queue, who may try to reference this
now-deallocated memory.
This causes the following policy generation errors on Android:
FAILED:
out/target/product/bullhead/obj/ETC/plat_sepolicy.cil_intermediates/plat_policy_nvr.cil
/bin/bash -c "out/host/linux-x86/bin/checkpolicy -M -C -c 30 -o
out/target/product/bullhead/obj/ETC/plat_sepolicy.cil_intermediates/plat_policy_nvr.cil
out/target/product/bullhead/obj/ETC/plat_sepolicy.cil_intermediates/plat_policy.conf"
system/sepolicy/public/app.te:241:ERROR 'only ioctl extended permissions
are supported' at token ';' on line 6784:
#line 241
} };
checkpolicy: error(s) encountered while parsing configuration
because the value of "id" in:
id = queue_remove(id_queue);
if (strcmp(id,"ioctl") == 0) {
...
} else {
yyerror("only ioctl extended permissions are supported");
...
}
is now garbage.
This is a partial revert of the following commit:
c1ba8311 checkpolicy: free id where it was leaked
Signed-off-by: Nick Kralevich <[email protected]>
1 file changed
