lkdtm: fortify: Fix potential NULL dereference on kmalloc failure

Add missing NULL pointer checks after kmalloc() calls in
lkdtm_FORTIFY_STR_MEMBER() and lkdtm_FORTIFY_MEM_MEMBER() functions.

Signed-off-by: Junjie Cao <junjie.cao@intel.com>
Link: https://lore.kernel.org/r/20250814060605.5264-1-junjie.cao@intel.com
Signed-off-by: Kees Cook <kees@kernel.org>

diff --git a/drivers/misc/lkdtm/fortify.c b/drivers/misc/lkdtm/fortify.c
index 0159276..00ed214 100644 (file)
--- a/drivers/misc/lkdtm/fortify.c
+++ b/drivers/misc/lkdtm/fortify.c
@@ -44,6 +44,9 @@ static void lkdtm_FORTIFY_STR_MEMBER(void)
        char *src;
 
        src = kmalloc(size, GFP_KERNEL);
+       if (!src)
+               return;
+
        strscpy(src, "over ten bytes", size);
        size = strlen(src) + 1;
 
@@ -109,6 +112,9 @@ static void lkdtm_FORTIFY_MEM_MEMBER(void)
        char *src;
 
        src = kmalloc(size, GFP_KERNEL);
+       if (!src)
+               return;
+
        strscpy(src, "over ten bytes", size);
        size = strlen(src) + 1;