[PATCH 6.17 018/184] lkdtm: fortify: Fix potential NULL dereference on kmalloc failure

6.17-stable review patch. If anyone has any objections, please let me know.

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From: Junjie Cao junjie.cao@intel.com

[ Upstream commit 01c7344e21c2140e72282d9d16d79a61f840fc20 ]

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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/misc/lkdtm/fortify.c | 6 ++++++ 1 file changed, 6 insertions(+)

diff --git a/drivers/misc/lkdtm/fortify.c b/drivers/misc/lkdtm/fortify.c index 0159276656780..00ed2147113e6 100644 --- 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;