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authorEliot Blennerhassett <eblennerhassett@audioscience.com>2011-08-02 09:44:24 +1200
committerTakashi Iwai <tiwai@suse.de>2011-08-02 09:26:31 +0200
commit08f984c7f7f569b66acbbd163676b4bc7f64addc (patch)
tree333d7e308511ba0a3f47c9129a065f3603a52772
parentdc889f18646325d07eb24ef634f082d60b0beebb (diff)
ALSA: asihpi - Clarify adapter index validity check
Avoids assigning possibly invalid address to pa, even if it is never dereferenced. Correct error response to reflect request object/function ids. Signed-off-by: Eliot Blennerhassett <eblennerhassett@audioscience.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--sound/pci/asihpi/hpioctl.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/sound/pci/asihpi/hpioctl.c b/sound/pci/asihpi/hpioctl.c
index 9683f84ecdc..a32502e796d 100644
--- a/sound/pci/asihpi/hpioctl.c
+++ b/sound/pci/asihpi/hpioctl.c
@@ -177,16 +177,21 @@ long asihpi_hpi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
} else {
u16 __user *ptr = NULL;
u32 size = 0;
-
+ u32 adapter_present;
/* -1=no data 0=read from user mem, 1=write to user mem */
int wrflag = -1;
- u32 adapter = hm->h.adapter_index;
- struct hpi_adapter *pa = &adapters[adapter];
+ struct hpi_adapter *pa;
+
+ if (hm->h.adapter_index < HPI_MAX_ADAPTERS) {
+ pa = &adapters[hm->h.adapter_index];
+ adapter_present = pa->type;
+ } else {
+ adapter_present = 0;
+ }
- if ((adapter >= HPI_MAX_ADAPTERS) || (!pa->type)) {
- hpi_init_response(&hr->r0, HPI_OBJ_ADAPTER,
- HPI_ADAPTER_OPEN,
- HPI_ERROR_BAD_ADAPTER_NUMBER);
+ if (!adapter_present) {
+ hpi_init_response(&hr->r0, hm->h.object,
+ hm->h.function, HPI_ERROR_BAD_ADAPTER_NUMBER);
uncopied_bytes =
copy_to_user(puhr, hr, sizeof(hr->h));