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| author | Phillip Potter <phil@philpotter.co.uk> | 2021-03-31 23:07:19 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-11 14:04:04 +0200 |
| commit | 4928d3b02083c88a8089562469e4e250b4fe864c (patch) | |
| tree | 9bdf937b3b97375ff6c5fe7418fa3bc4a55d84f5 /drivers/video/fbdev | |
| parent | 1c5cb86cdd7fd379f9f5ef70a494fee28394a4ae (diff) | |
| download | linux-4928d3b02083c88a8089562469e4e250b4fe864c.tar.gz linux-4928d3b02083c88a8089562469e4e250b4fe864c.tar.bz2 linux-4928d3b02083c88a8089562469e4e250b4fe864c.zip | |
fbdev: zero-fill colormap in fbcmap.c
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@syzkaller.appspotmail.com
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210331220719.1499743-1-phil@philpotter.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/video/fbdev')
| -rw-r--r-- | drivers/video/fbdev/core/fbcmap.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/video/fbdev/core/fbcmap.c b/drivers/video/fbdev/core/fbcmap.c index e5ae33c1a8e8..e8a17fb715ac 100644 --- 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 *cmap, int len, int transp, gfp_t flags) 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 { |