[PATCH 4.9 102/104] ALSA: au88x0: avoid theoretical uninitialized access

From: Greg Kroah-Hartman
Date: Fri Oct 06 2017 - 04:56:54 EST

4.9-stable review patch. If anyone has any objections, please let me know.


From: Arnd Bergmann <arnd@xxxxxxxx>

commit 13f99ebdd602ebdafb909e15ec6ffb1e34690167 upstream.

The latest gcc-7.0.1 snapshot points out that we if nr_ch is zero, we never
initialize some variables:

sound/pci/au88x0/au88x0_core.c: In function 'vortex_adb_allocroute':
sound/pci/au88x0/au88x0_core.c:2304:68: error: 'mix[0]' may be used uninitialized in this function [-Werror=maybe-uninitialized]
sound/pci/au88x0/au88x0_core.c:2305:58: error: 'src[0]' may be used uninitialized in this function [-Werror=maybe-uninitialized]

I assume this can never happen in practice, but adding a check here doesn't
hurt either and avoids the warning. The code has been unchanged since
the start of git history.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

sound/pci/au88x0/au88x0_core.c | 3 +++
1 file changed, 3 insertions(+)

--- a/sound/pci/au88x0/au88x0_core.c
+++ b/sound/pci/au88x0/au88x0_core.c
@@ -2279,6 +2279,9 @@ vortex_adb_allocroute(vortex_t *vortex,
} else {
int src[2], mix[2];

+ if (nr_ch < 1)
+ return -EINVAL;
/* Get SRC and MIXER hardware resources. */
for (i = 0; i < nr_ch; i++) {
if ((mix[i] =