Commit c6519c6d authored by Benjamin Gray's avatar Benjamin Gray Committed by Michael Ellerman
Browse files

powerpc/uaccess: Cast away __user annotation after verification 



Sparse reports dereference of a __user pointer. copy_mc_to_user() takes
a __user pointer, verifies it, then calls the generic copy routine
copy_mc_generic().

As we have verified the pointer, cast out the __user annotation when
passing to copy_mc_generic().

Signed-off-by: default avatarBenjamin Gray <bgray@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231011053711.93427-10-bgray@linux.ibm.com
parent 8577dd00

arch/powerpc/include/asm/uaccess.h

+1 −1
Original line number Diff line number Diff line
@@ -374,7 +374,7 @@ copy_mc_to_user(void __user *to, const void *from, unsigned long n) 
	if (check_copy_size(from, n, true)) {

		if (access_ok(to, n)) {

			allow_write_to_user(to, n);

			n = copy_mc_generic((void *)to, from, n);

			n = copy_mc_generic((void __force *)to, from, n);

			prevent_write_to_user(to, n);

		}

	}