This is a note to let you know that I've just added the patch titled fbdev: zero-fill colormap in fbcmap.c to the 4.19-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-zero-fill-colormap-in-fbcmap.c.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 19ab233989d0f7ab1de19a036e247afa4a0a1e9c Mon Sep 17 00:00:00 2001 From: Phillip Potter <phil@xxxxxxxxxxxxxxxx> Date: Wed, 31 Mar 2021 23:07:19 +0100 Subject: fbdev: zero-fill colormap in fbcmap.c From: Phillip Potter <phil@xxxxxxxxxxxxxxxx> commit 19ab233989d0f7ab1de19a036e247afa4a0a1e9c upstream. Use kzalloc() rather than kmalloc() for the dynamically allocated parts of the colormap in fb_alloc_cmap_gfp, to prevent a leak of random kernel data to userspace under certain circumstances. Fixes a KMSAN-found infoleak bug reported by syzbot at: https://syzkaller.appspot.com/bug?id=741578659feabd108ad9e06696f0c1f2e69c4b6e Reported-by: syzbot+47fa9c9c648b765305b9@xxxxxxxxxxxxxxxxxxxxxxxxx Cc: stable <stable@xxxxxxxxxxxxxxx> Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> Signed-off-by: Phillip Potter <phil@xxxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210331220719.1499743-1-phil@xxxxxxxxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/video/fbdev/core/fbcmap.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/drivers/video/fbdev/core/fbcmap.c +++ b/drivers/video/fbdev/core/fbcmap.c @@ -101,17 +101,17 @@ int fb_alloc_cmap_gfp(struct fb_cmap *cm if (!len) return 0; - cmap->red = kmalloc(size, flags); + cmap->red = kzalloc(size, flags); if (!cmap->red) goto fail; - cmap->green = kmalloc(size, flags); + cmap->green = kzalloc(size, flags); if (!cmap->green) goto fail; - cmap->blue = kmalloc(size, flags); + cmap->blue = kzalloc(size, flags); if (!cmap->blue) goto fail; if (transp) { - cmap->transp = kmalloc(size, flags); + cmap->transp = kzalloc(size, flags); if (!cmap->transp) goto fail; } else { Patches currently in stable-queue which might be from phil@xxxxxxxxxxxxxxxx are queue-4.19/fbdev-zero-fill-colormap-in-fbcmap.c.patch