Patch "firmware: dmi: Stop decoding on broken entry" has been added to the 5.15-stable tree

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

    firmware: dmi: Stop decoding on broken entry

to the 5.15-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:
     firmware-dmi-stop-decoding-on-broken-entry.patch
and it can be found in the queue-5.15 subdirectory.

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



commit 8cdec862cede34e6652d66ab814025842efa3d4a
Author: Jean Delvare <jdelvare@xxxxxxx>
Date:   Tue Apr 30 18:29:32 2024 +0200

    firmware: dmi: Stop decoding on broken entry
    
    [ Upstream commit 0ef11f604503b1862a21597436283f158114d77e ]
    
    If a DMI table entry is shorter than 4 bytes, it is invalid. Due to
    how DMI table parsing works, it is impossible to safely recover from
    such an error, so we have to stop decoding the table.
    
    Signed-off-by: Jean Delvare <jdelvare@xxxxxxx>
    Link: https://lore.kernel.org/linux-kernel/Zh2K3-HLXOesT_vZ@liuwe-devbox-debian-v2/T/
    Reviewed-by: Michael Kelley <mhklinux@xxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index f191a1f901ac7..dcfddde767d1a 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -101,6 +101,17 @@ static void dmi_decode_table(u8 *buf,
 	       (data - buf + sizeof(struct dmi_header)) <= dmi_len) {
 		const struct dmi_header *dm = (const struct dmi_header *)data;
 
+		/*
+		 * If a short entry is found (less than 4 bytes), not only it
+		 * is invalid, but we cannot reliably locate the next entry.
+		 */
+		if (dm->length < sizeof(struct dmi_header)) {
+			pr_warn(FW_BUG
+				"Corrupted DMI table, offset %zd (only %d entries processed)\n",
+				data - buf, i);
+			break;
+		}
+
 		/*
 		 *  We want to know the total length (formatted area and
 		 *  strings) before decoding to make sure we won't run off the




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