lttng lib: ring buffer remove duplicate null pointer
* Dan Carpenter <dan.carpenter@oracle.com> wrote: > The patch c844b2f5: "lttng lib: ring buffer" from Nov 28, 2011, > leads to the following Smatch complaint: > > drivers/staging/lttng/lib/ringbuffer/ring_buffer_mmap.c +33 > +lib_ring_buffer_fault() > warn: variable dereferenced before check 'buf' (see line 26) > > drivers/staging/lttng/lib/ringbuffer/ring_buffer_mmap.c > 25 struct lib_ring_buffer *buf = vma->vm_private_data; > 26 struct channel *chan = buf->backend.chan; > ^^^^^^^^^^^^^^^^^ > Dereference. > > 27 const struct lib_ring_buffer_config *config = chan->backend.config; > 28 pgoff_t pgoff = vmf->pgoff; > 29 struct page **page; > 30 void **virt; > 31 unsigned long offset, sb_bindex; > 32 > 33 if (!buf) > ^^^^ > Check. > > 34 return VM_FAULT_OOM; > 35 This check is performed at mapping setup time in lib_ring_buffer_mmap_buf() already, so we can safely remove this duplicata. Reported-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NMathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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