* [PATCH] [video/fbdev] mbxfb_remove: fix null pointer dereference
@ 2020-07-26 5:20 Gaurav Singh
2020-07-26 8:57 ` Andy Shevchenko
0 siblings, 1 reply; 2+ messages in thread
From: Gaurav Singh @ 2020-07-26 5:20 UTC (permalink / raw)
To: gaurav1086, Bartlomiej Zolnierkiewicz, Arnd Bergmann,
Daniel Vetter, Jani Nikula, open list:FRAMEBUFFER LAYER,
open list:FRAMEBUFFER LAYER, open list
Function mbxfb_debugfs_remove() accesses fbi->par without NULL check,
hence do the NULL check in the caller mbxfb_remove().
Signed-off-by: Gaurav Singh <gaurav1086@gmail.com>
---
drivers/video/fbdev/mbx/mbxfb.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/video/fbdev/mbx/mbxfb.c b/drivers/video/fbdev/mbx/mbxfb.c
index 6dc287c819cb..515c0cda1994 100644
--- a/drivers/video/fbdev/mbx/mbxfb.c
+++ b/drivers/video/fbdev/mbx/mbxfb.c
@@ -1012,11 +1012,10 @@ static int mbxfb_remove(struct platform_device *dev)
write_reg_dly(SYSRST_RST, SYSRST);
- mbxfb_debugfs_remove(fbi);
-
if (fbi) {
struct mbxfb_info *mfbi = fbi->par;
+ mbxfb_debugfs_remove(fbi);
unregister_framebuffer(fbi);
if (mfbi) {
if (mfbi->platform_remove)
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] [video/fbdev] mbxfb_remove: fix null pointer dereference
2020-07-26 5:20 [PATCH] [video/fbdev] mbxfb_remove: fix null pointer dereference Gaurav Singh
@ 2020-07-26 8:57 ` Andy Shevchenko
0 siblings, 0 replies; 2+ messages in thread
From: Andy Shevchenko @ 2020-07-26 8:57 UTC (permalink / raw)
To: Gaurav Singh
Cc: open list:FRAMEBUFFER LAYER, Arnd Bergmann,
Bartlomiej Zolnierkiewicz, Jani Nikula, Daniel Vetter, open list,
open list:FRAMEBUFFER LAYER
On Sun, Jul 26, 2020 at 8:26 AM Gaurav Singh <gaurav1086@gmail.com> wrote:
>
> Function mbxfb_debugfs_remove() accesses fbi->par without NULL check,
> hence do the NULL check in the caller mbxfb_remove().
...
> @@ -1012,11 +1012,10 @@ static int mbxfb_remove(struct platform_device *dev)
>
> write_reg_dly(SYSRST_RST, SYSRST);
>
> - mbxfb_debugfs_remove(fbi);
> -
> if (fbi) {
Can you explain how this is NULL on ->remove()?
I bet this check is simply redundant. But you have to check and update
commit message accordingly.
> struct mbxfb_info *mfbi = fbi->par;
>
> + mbxfb_debugfs_remove(fbi);
> unregister_framebuffer(fbi);
> if (mfbi) {
> if (mfbi->platform_remove)
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-07-26 8:57 ` Andy Shevchenko
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