Messages in this thread Patch in this message | | | From | Jiasheng Jiang <> | Subject | [PATCH] lkdtm: potential dereference of null pointer | Date | Thu, 16 Dec 2021 09:59:32 +0800 |
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The return value of kmalloc() needs to be checked. To avoid use in execute_location() in case of the failure of alloc.
Fixes: 039a1c42058d ("lkdtm: Relocate code to subdirectory") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> --- drivers/misc/lkdtm/perms.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/misc/lkdtm/perms.c b/drivers/misc/lkdtm/perms.c index 2dede2ef658f..ef87d9cc2e96 100644 --- a/drivers/misc/lkdtm/perms.c +++ b/drivers/misc/lkdtm/perms.c @@ -138,6 +138,8 @@ void lkdtm_EXEC_STACK(void) void lkdtm_EXEC_KMALLOC(void) { u32 *kmalloc_area = kmalloc(EXEC_SIZE, GFP_KERNEL); + if (!kmalloc_area) + return; execute_location(kmalloc_area, CODE_WRITE); kfree(kmalloc_area); } @@ -145,6 +147,8 @@ void lkdtm_EXEC_KMALLOC(void) void lkdtm_EXEC_VMALLOC(void) { u32 *vmalloc_area = vmalloc(EXEC_SIZE); + if (!vmalloc_area) + return; execute_location(vmalloc_area, CODE_WRITE); vfree(vmalloc_area); } -- 2.25.1
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