Fixed by moving the check higher up, to lib_ring_buffer_open. Thanks!
Mathieu * Dan Carpenter ([email protected]) wrote: > Hello Mathieu Desnoyers, > > This is a semi-automatic email about new static checker warnings. > > The patch c844b2f5cfea: "lttng lib: ring buffer" from Nov 28, 2011, > leads to the following Smatch complaint: > > drivers/staging/lttng/lib/ringbuffer/ring_buffer_mmap.c +86 > lib_ring_buffer_mmap_buf() > warn: variable dereferenced before check 'buf' (see line 79) > > drivers/staging/lttng/lib/ringbuffer/ring_buffer_mmap.c > 78 unsigned long length = vma->vm_end - vma->vm_start; > 79 struct channel *chan = buf->backend.chan; > ^^^^^^^^^^^^^^^^^ > Dereference. > > 80 const struct lib_ring_buffer_config *config = > chan->backend.config; > 81 unsigned long mmap_buf_len; > 82 > 83 if (config->output != RING_BUFFER_MMAP) > 84 return -EINVAL; > 85 > 86 if (!buf) > ^^^^ > Check. > > 87 return -EBADF; > 88 > > regards, > dan carpenter > -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com _______________________________________________ lttng-dev mailing list [email protected] http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
