From c2d22806aecb24e2de55c30a06e5d6eb297d161d Mon Sep 17 00:00:00 2001
From: Zhang Shurong <zhang_shurong@foxmail.com>
Date: Sun, 25 Jun 2023 00:16:49 +0800
Subject: [PATCH] fbdev: fix potential OOB read in fast_imageblit()
Git-commit: c2d22806aecb24e2de55c30a06e5d6eb297d161d
Patch-mainline: v6.5-rc1
References: git-fixes

There is a potential OOB read at fast_imageblit, for
"colortab[(*src >> 4)]" can become a negative value due to
"const char *s = image->data, *src".
This change makes sure the index for colortab always positive
or zero.

Similar commit:
https://patchwork.kernel.org/patch/11746067

Potential bug report:
https://groups.google.com/g/syzkaller-bugs/c/9ubBXKeKXf4/m/k-QXy4UgAAAJ

Signed-off-by: Zhang Shurong <zhang_shurong@foxmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/video/fbdev/core/sysimgblt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/core/sysimgblt.c b/drivers/video/fbdev/core/sysimgblt.c
index 335e92b813fc..665ef7a0a249 100644
--- a/drivers/video/fbdev/core/sysimgblt.c
+++ b/drivers/video/fbdev/core/sysimgblt.c
@@ -189,7 +189,7 @@ static void fast_imageblit(const struct fb_image *image, struct fb_info *p,
 	u32 fgx = fgcolor, bgx = bgcolor, bpp = p->var.bits_per_pixel;
 	u32 ppw = 32/bpp, spitch = (image->width + 7)/8;
 	u32 bit_mask, eorx, shift;
-	const char *s = image->data, *src;
+	const u8 *s = image->data, *src;
 	u32 *dst;
 	const u32 *tab;
 	size_t tablen;
-- 
2.35.3