ALSA: asihpi: fix iounmap in error handler

clang static analysis flags this problem
hpioctl.c:513:7: warning: Branch condition evaluates to
  a garbage value
                if (pci.ap_mem_base[idx]) {
                    ^~~~~~~~~~~~~~~~~~~~

If there is a failure in the middle of the memory space loop,
only some of the memory spaces need to be cleaned up.

At the error handler, idx holds the number of successful
memory spaces mapped.  So rework the handler loop to use the
old idx.

There is a second problem, the memory space loop conditionally
iomaps()/sets the mem_base so it is necessay to initize pci.

Fixes: 719f82d3987a ("ALSA: Add support of AudioScience ASI boards")
Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20200913165230.17166-1-trix@redhat.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/asihpi/hpioctl.c b/sound/pci/asihpi/hpioctl.c
index 496dcde9715d6df1a7fb640f6ee3f025a8a483b0..9790f5108a166859603ca0ff7c98a331f242a100 100644 (file)
--- a/sound/pci/asihpi/hpioctl.c
+++ b/sound/pci/asihpi/hpioctl.c
@@ -343,7 +343,7 @@ int asihpi_adapter_probe(struct pci_dev *pci_dev,
        struct hpi_message hm;
        struct hpi_response hr;
        struct hpi_adapter adapter;
-       struct hpi_pci pci;
+       struct hpi_pci pci = { 0 };
 
        memset(&adapter, 0, sizeof(adapter));
 
@@ -499,7 +499,7 @@ int asihpi_adapter_probe(struct pci_dev *pci_dev,
        return 0;
 
 err:
-       for (idx = 0; idx < HPI_MAX_ADAPTER_MEM_SPACES; idx++) {
+       while (--idx >= 0) {
                if (pci.ap_mem_base[idx]) {
                        iounmap(pci.ap_mem_base[idx]);
                        pci.ap_mem_base[idx] = NULL;