From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Fri, 7 May 2021 15:52:31 +0000 (+0200)
Subject: 4.19-stable patches
X-Git-Tag: v5.4.118~87
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b11bfc08760b3dabdbfce9793db394610e1a2bf8;p=thirdparty%2Fkernel%2Fstable-queue.git

4.19-stable patches

added patches:
	fbdev-zero-fill-colormap-in-fbcmap.c.patch
---

diff --git a/queue-4.19/fbdev-zero-fill-colormap-in-fbcmap.c.patch b/queue-4.19/fbdev-zero-fill-colormap-in-fbcmap.c.patch
new file mode 100644
index 00000000000..2196dd1ea0c
--- /dev/null
+++ b/queue-4.19/fbdev-zero-fill-colormap-in-fbcmap.c.patch
@@ -0,0 +1,51 @@
+From 19ab233989d0f7ab1de19a036e247afa4a0a1e9c Mon Sep 17 00:00:00 2001
+From: Phillip Potter <phil@philpotter.co.uk>
+Date: Wed, 31 Mar 2021 23:07:19 +0100
+Subject: fbdev: zero-fill colormap in fbcmap.c
+
+From: Phillip Potter <phil@philpotter.co.uk>
+
+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>
+---
+ 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 {
diff --git a/queue-4.19/series b/queue-4.19/series
index 7b1eb66bd82..b2a3e7d090d 100644
--- a/queue-4.19/series
+++ b/queue-4.19/series
@@ -19,3 +19,4 @@ erofs-add-unsupported-inode-i_format-check.patch
 cifs-return-correct-error-code-from-smb2_get_enc_key.patch
 btrfs-fix-metadata-extent-leak-after-failure-to-create-subvolume.patch
 intel_th-pci-add-rocket-lake-cpu-support.patch
+fbdev-zero-fill-colormap-in-fbcmap.c.patch