* [PATCH 3/3] video: fbdev: fix the out-of-bounds access cr_data->bak
@ 2021-02-01 15:56 Wenjia Zhao
0 siblings, 0 replies; only message in thread
From: Wenjia Zhao @ 2021-02-01 15:56 UTC (permalink / raw)
Cc: driverfuzzing, Florian Tobias Schandinat,
Bartlomiej Zolnierkiewicz, linux-fbdev, dri-devel, linux-kernel
The size of cr_data->bak is CURSOR_SIZE/4, however the access size in
the is
CURSOR_SIZE in the loop. It causes the out-of-bounds access.
Signed-off-by: Wenjia Zhao <driverfuzzing@gmail.com>
---
drivers/video/fbdev/via/viafbdev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/via/viafbdev.c b/drivers/video/fbdev/via/viafbdev.c
index 22deb34..ef217cc 100644
--- a/drivers/video/fbdev/via/viafbdev.c
+++ b/drivers/video/fbdev/via/viafbdev.c
@@ -839,7 +839,7 @@ static int viafb_cursor(struct fb_info *info, struct fb_cursor *cursor)
if (cursor->set & FB_CUR_SETSHAPE) {
struct {
u8 data[CURSOR_SIZE];
- u32 bak[CURSOR_SIZE / 4];
+ u32 bak[CURSOR_SIZE];
} *cr_data = kzalloc(sizeof(*cr_data), GFP_ATOMIC);
int size = ((cursor->image.width + 7) >> 3) *
cursor->image.height;
--
2.7.4
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