V4L/DVB (3738): Saa7134: Fix oops with disable_ir=1

When disable_ir=1 parameter is used, or when saa7134_input_init1()
fails for any other reason, dev->remote will remain NULL, and the
driver will oops in saa7134_hwinit2().  Therefore dev->remote must be
checked before dereferencing.

Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/media/video/saa7134/saa7134-core.c b/drivers/media/video/saa7134/saa7134-core.c
index 13de05532e0a..f0c2111f14ad 100644
--- a/drivers/media/video/saa7134/saa7134-core.c
+++ b/drivers/media/video/saa7134/saa7134-core.c
@@ -548,6 +548,8 @@ static irqreturn_t saa7134_irq(int irq, void *dev_id, struct pt_regs *regs)
                 if (report & SAA7134_IRQ_REPORT_GPIO16) {
                         switch (dev->has_remote) {
                                 case SAA7134_REMOTE_GPIO:
+                                        if (!dev->remote)
+                                                break;
                                         if  (dev->remote->mask_keydown & 0x10000) {
                                                 saa7134_input_irq(dev);
                                         }
@@ -564,6 +566,8 @@ static irqreturn_t saa7134_irq(int irq, void *dev_id, struct pt_regs *regs)
                 if (report & SAA7134_IRQ_REPORT_GPIO18) {
                         switch (dev->has_remote) {
                                 case SAA7134_REMOTE_GPIO:
+                                        if (!dev->remote)
+                                                break;
                                         if ((dev->remote->mask_keydown & 0x40000) ||
                                             (dev->remote->mask_keyup & 0x40000)) {
                                                 saa7134_input_irq(dev);
@@ -676,7 +680,7 @@ static int saa7134_hwinit2(struct saa7134_dev *dev)
                 SAA7134_IRQ2_INTE_PE      |
                 SAA7134_IRQ2_INTE_AR;
 
-        if (dev->has_remote == SAA7134_REMOTE_GPIO) {
+        if (dev->has_remote == SAA7134_REMOTE_GPIO && dev->remote) {
                 if (dev->remote->mask_keydown & 0x10000)
                         irq2_mask |= SAA7134_IRQ2_INTE_GPIO16;
                 else if (dev->remote->mask_keydown & 0x40000)