[v3,21/75] x86/boot/compressed/64: Check return value of kernel_ident_mapping_init()
diff mbox series

Message ID 20200428151725.31091-22-joro@8bytes.org
State New
Headers show
Series
  • x86: SEV-ES Guest Support
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Commit Message

Joerg Roedel April 28, 2020, 3:16 p.m. UTC
From: Joerg Roedel <jroedel@suse.de>

The function can fail to create an identity mapping, check for that
and bail out if it happens.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 arch/x86/boot/compressed/ident_map_64.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Patch
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diff --git a/arch/x86/boot/compressed/ident_map_64.c b/arch/x86/boot/compressed/ident_map_64.c
index 6ee089fdc65a..5d8b0bffe421 100644
--- a/arch/x86/boot/compressed/ident_map_64.c
+++ b/arch/x86/boot/compressed/ident_map_64.c
@@ -93,6 +93,8 @@  static struct x86_mapping_info mapping_info;
  */
 static void add_identity_map(unsigned long start, unsigned long end)
 {
+	int ret;
+
 	/* Align boundary to 2M. */
 	start = round_down(start, PMD_SIZE);
 	end = round_up(end, PMD_SIZE);
@@ -100,8 +102,9 @@  static void add_identity_map(unsigned long start, unsigned long end)
 		return;
 
 	/* Build the mapping. */
-	kernel_ident_mapping_init(&mapping_info, (pgd_t *)top_level_pgt,
-				  start, end);
+	ret = kernel_ident_mapping_init(&mapping_info, (pgd_t *)top_level_pgt, start, end);
+	if (ret)
+		error("Error: kernel_ident_mapping_init() failed\n");
 }
 
 /* Locates and clears a region for a new top level page table. */