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From: Luca Fancellu <luca.fancellu@arm.com>
To: xen-devel@lists.xenproject.org
Cc: bertrand.marquis@arm.com, wei.chen@arm.com,
	Stefano Stabellini <sstabellini@kernel.org>,
	Julien Grall <julien@xen.org>,
	Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
Subject: [PATCH] arm/efi: Fix null pointer dereference
Date: Mon, 11 Oct 2021 08:56:38 +0100	[thread overview]
Message-ID: <20211011075638.23785-1-luca.fancellu@arm.com> (raw)

Fix for commit 60649d443dc395243e74d2b3e05594ac0c43cfe3
that introduces a null pointer dereference when the
fdt_node_offset_by_compatible is called with "fdt"
argument null.

Reported-by: Julien Grall <julien@xen.org>
Fixes: 60649d443d ("arm/efi: Introduce xen,uefi-cfg-load DT property")
Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
---
 xen/arch/arm/efi/efi-boot.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/efi/efi-boot.h b/xen/arch/arm/efi/efi-boot.h
index a3e46453d4..e63dafac26 100644
--- a/xen/arch/arm/efi/efi-boot.h
+++ b/xen/arch/arm/efi/efi-boot.h
@@ -593,7 +593,8 @@ static bool __init efi_arch_use_config_file(EFI_SYSTEM_TABLE *SystemTable)
     dtbfile.ptr = fdt;
     dtbfile.need_to_free = false; /* Config table memory can't be freed. */
 
-    if ( fdt_node_offset_by_compatible(fdt, 0, "multiboot,module") > 0 )
+    if ( fdt &&
+         (fdt_node_offset_by_compatible(fdt, 0, "multiboot,module") > 0) )
     {
         /* Locate chosen node */
         int node = fdt_subnode_offset(fdt, 0, "chosen");
-- 
2.17.1



             reply	other threads:[~2021-10-11  7:57 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-11  7:56 Luca Fancellu [this message]
2021-10-11  9:37 ` [PATCH] arm/efi: Fix null pointer dereference Bertrand Marquis
2021-10-11 17:33   ` Stefano Stabellini

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