[PATCH] Fixes: null pointer dereference in pfnmap_lockdep_assert

[Manas via B4 Relay]

From: Manas <manas18244@xxxxxxxxxxx>

syzbot has pointed to a possible null pointer dereference in
pfnmap_lockdep_assert. vm_file member of vm_area_struct is being
dereferenced without any checks.

This fix returns if vm_file member in vm_area_struct is NULL.

Reported-by: syzbot+093d096417e7038a689b@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=093d096417e7038a689b
---
This bug[1] triggers a general protection fault in follow_pfnmap_start
function. An assertion pfnmap_lockdep_assert inside this function
dereferences vm_file member of vm_area_struct. And panic gets triggered
when vm_file is NULL.

This patch returns from the assertion pfnmap_lockdep_assert if vm_file
is found to be NULL.

[1] https://syzkaller.appspot.com/bug?extid=093d096417e7038a689b

Signed-off-by: Manas <manas18244@xxxxxxxxxxx>
---
 mm/memory.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/memory.c b/mm/memory.c
index 2366578015ad..b152a95e543f 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -6346,6 +6346,9 @@ static inline void pfnmap_args_setup(struct follow_pfnmap_args *args,
 static inline void pfnmap_lockdep_assert(struct vm_area_struct *vma)
 {
 #ifdef CONFIG_LOCKDEP
+	if (!vma->vm_file)
+		return;
+
 	struct address_space *mapping = vma->vm_file->f_mapping;
 
 	if (mapping)

---
base-commit: 9852d85ec9d492ebef56dc5f229416c925758edc
change-id: 20241003-fix-null-deref-6bfa0337efc3

Best regards,
-- 
Manas <manas18244@xxxxxxxxxxx>