Patch "fbdev: fix potential OOB read in fast_imageblit()" has been added to the 6.3-stable tree

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This is a note to let you know that I've just added the patch titled

    fbdev: fix potential OOB read in fast_imageblit()

to the 6.3-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fbdev-fix-potential-oob-read-in-fast_imageblit.patch
and it can be found in the queue-6.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From c2d22806aecb24e2de55c30a06e5d6eb297d161d Mon Sep 17 00:00:00 2001
From: Zhang Shurong <zhang_shurong@xxxxxxxxxxx>
Date: Sun, 25 Jun 2023 00:16:49 +0800
Subject: fbdev: fix potential OOB read in fast_imageblit()

From: Zhang Shurong <zhang_shurong@xxxxxxxxxxx>

commit c2d22806aecb24e2de55c30a06e5d6eb297d161d upstream.

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@xxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/video/fbdev/core/sysimgblt.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/video/fbdev/core/sysimgblt.c
+++ b/drivers/video/fbdev/core/sysimgblt.c
@@ -189,7 +189,7 @@ static void fast_imageblit(const struct
 	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;


Patches currently in stable-queue which might be from zhang_shurong@xxxxxxxxxxx are

queue-6.3/fbdev-fix-potential-oob-read-in-fast_imageblit.patch



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