s390/mm: Add NULL pointer check to crst_table_free() base_crst_free()

b5efb63a · Heiko Carstens <[email protected]> · 2024-07-09 08:50:56 +02:00

crst_table_free() used to work with NULL pointers before the conversion
to ptdescs.  Since crst_table_free() can be called with a NULL pointer
(error handling in crst_table_upgrade() add an explicit check.

Also add the same check to base_crst_free() for consistency reasons.

In real life this should not happen, since order two GFP_KERNEL
allocations will not fail, unless FAIL_PAGE_ALLOC is enabled and used.

Reported-by: Yunseong Kim <[email protected]>
Fixes: 6326c26c1514 ("s390: convert various pgalloc functions to use ptdescs")
Signed-off-by: Heiko Carstens <[email protected]>
Acked-by: Alexander Gordeev <[email protected]>
Cc: [email protected]
Signed-off-by: Linus Torvalds <[email protected]>

Commit: b5efb63acf7bddaf20eacfcac654c25c446eabe8
Parents: 4376e966

Changes

1 files changed · +4 −0

File	Status	Add	Del	Content
arch/s390/mm/pgalloc.c	modified	+4	−0	View file

arch/s390/mm/pgalloc.c

View file

diff --git a/arch/s390/mm/pgalloc.c b/arch/s390/mm/pgalloc.c
index abb629d..7e3e767 100644
--- a/arch/s390/mm/pgalloc.c
+++ b/arch/s390/mm/pgalloc.c
@@ -55,6 +55,8 @@ unsigned long *crst_table_alloc(struct mm_struct *mm)
 
 void crst_table_free(struct mm_struct *mm, unsigned long *table)
 {
+	if (!table)
+		return;
 	pagetable_free(virt_to_ptdesc(table));
 }
 
@@ -262,6 +264,8 @@ static unsigned long *base_crst_alloc(unsigned long val)
 
 static void base_crst_free(unsigned long *table)
 {
+	if (!table)
+		return;
 	pagetable_free(virt_to_ptdesc(table));
 }
 