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xtensa: fix access check in csum_and_copy_from_user 

Commit d341659f47 ("xtensa: switch to providing
csum_and_copy_from_user()") introduced access check, but incorrectly
tested dst instead of src.
Fix access_ok argument in csum_and_copy_from_user.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Fixes: d341659f47 ("xtensa: switch to providing csum_and_copy_from_user()")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Max Filippov 2020-07-21 15:00:35 -07:00 committed by Al Viro
parent b3a9e3b962
commit 5fff09bc14
1 changed files with 1 additions and 1 deletions
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2
arch/xtensa/include/asm/checksum.h
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@ -57,7 +57,7 @@ static inline
__wsum csum_and_copy_from_user(const void __user *src, void *dst,
int len, __wsum sum, int *err_ptr)
{
if (access_ok(dst, len))
if (access_ok(src, len))
return csum_partial_copy_generic((__force const void *)src, dst,
len, sum, err_ptr, NULL);
if (len)