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powerpc/uaccess: Cast away __user annotation after verification

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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: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231011053711.93427-10-bgray@linux.ibm.com
This commit is contained in:
Benjamin Gray 2023-10-11 16:37:08 +11:00 committed by Michael Ellerman
parent 8577dd00a6
commit c6519c6df0
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/include/asm/uaccess.h
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@ -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);
}
}