ALSA: asihpi: fix iounmap in error handler

[ Upstream commit 472eb39103e885f302fd8fd6eff104fcf5503f1b ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/pci/asihpi/hpioctl.c b/sound/pci/asihpi/hpioctl.c
index b1a2a7ea4172331c07b50340c5d26ebe2f9e6bf0..b4ccd9f92400ee6357c2fe60063b8958a7937f95 100644 (file)
--- a/sound/pci/asihpi/hpioctl.c
+++ b/sound/pci/asihpi/hpioctl.c
@@ -350,7 +350,7 @@ 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));
 
@@ -506,7 +506,7 @@ 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;