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fbdev: zero-fill colormap in fbcmap.c
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>
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2954a6f12f
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19ab233989
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@ -101,17 +101,17 @@ int fb_alloc_cmap_gfp(struct fb_cmap *cmap, int len, int transp, gfp_t flags)
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if (!len)
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if (!len)
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return 0;
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return 0;
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cmap->red = kmalloc(size, flags);
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cmap->red = kzalloc(size, flags);
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if (!cmap->red)
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if (!cmap->red)
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goto fail;
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goto fail;
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cmap->green = kmalloc(size, flags);
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cmap->green = kzalloc(size, flags);
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if (!cmap->green)
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if (!cmap->green)
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goto fail;
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goto fail;
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cmap->blue = kmalloc(size, flags);
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cmap->blue = kzalloc(size, flags);
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if (!cmap->blue)
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if (!cmap->blue)
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goto fail;
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goto fail;
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if (transp) {
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if (transp) {
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cmap->transp = kmalloc(size, flags);
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cmap->transp = kzalloc(size, flags);
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if (!cmap->transp)
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if (!cmap->transp)
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goto fail;
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goto fail;
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} else {
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} else {
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