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authorJames Hogan <james.hogan@imgtec.com>2015-02-20 23:45:44 +0000
committerWim Van Sebroeck <wim@iguana.be>2015-03-27 08:47:42 +0100
commita629c08fdb98ebb184d745553af9dda4f05941bf (patch)
tree3671a36cf23d6f124b9c6e098f5abefb5004fff8
parent9ffd906d9a6e50c958bd99971d762a426a12a36a (diff)
downloadlinux-a629c08fdb98ebb184d745553af9dda4f05941bf.tar.gz
watchdog: imgpdc: Fix probe NULL pointer dereference
The IMG PDC watchdog probe function calls pdc_wdt_stop() prior to watchdog_set_drvdata(), causing a NULL pointer dereference when pdc_wdt_stop() retrieves the struct pdc_wdt_dev pointer using watchdog_get_drvdata() and reads the register base address through it. Fix by moving the watchdog_set_drvdata() call earlier, to where various other pdc_wdt->wdt_dev fields are initialised. Fixes: 93937669e9b5 ("watchdog: ImgTec PDC Watchdog Timer Driver") Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Ezequiel Garcia <ezequiel.garcia@imgtec.com> Cc: Naidu Tellapati <Naidu.Tellapati@imgtec.com> Cc: Jude Abraham <Jude.Abraham@imgtec.com> Cc: linux-watchdog@vger.kernel.org Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
-rw-r--r--drivers/watchdog/imgpdc_wdt.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/watchdog/imgpdc_wdt.c b/drivers/watchdog/imgpdc_wdt.c
index c8def68d9e4..32c35eb31e6 100644
--- a/drivers/watchdog/imgpdc_wdt.c
+++ b/drivers/watchdog/imgpdc_wdt.c
@@ -191,6 +191,7 @@ static int pdc_wdt_probe(struct platform_device *pdev)
pdc_wdt->wdt_dev.ops = &pdc_wdt_ops;
pdc_wdt->wdt_dev.max_timeout = 1 << PDC_WDT_CONFIG_DELAY_MASK;
pdc_wdt->wdt_dev.parent = &pdev->dev;
+ watchdog_set_drvdata(&pdc_wdt->wdt_dev, pdc_wdt);
ret = watchdog_init_timeout(&pdc_wdt->wdt_dev, heartbeat, &pdev->dev);
if (ret < 0) {
@@ -232,7 +233,6 @@ static int pdc_wdt_probe(struct platform_device *pdev)
watchdog_set_nowayout(&pdc_wdt->wdt_dev, nowayout);
platform_set_drvdata(pdev, pdc_wdt);
- watchdog_set_drvdata(&pdc_wdt->wdt_dev, pdc_wdt);
ret = watchdog_register_device(&pdc_wdt->wdt_dev);
if (ret)