[RFC][PATCH 06/14] ia64: turn csum_partial_copy_from_user() into csum_and_copy_from_user()

Al Viro
2020-03-27T23:31:58Z

Just use copy_from_user() there, rather than relying upon the wrapper
to have done access_ok()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/ia64/include/asm/checksum.h | 3 ++-
arch/ia64/lib/csum_partial_copy.c | 18 ++++--------------
2 files changed, 6 insertions(+), 15 deletions(-)

diff --git a/arch/ia64/include/asm/checksum.h b/arch/ia64/include/asm/checksum.h
index 0ed18bc3f6cf..279ea4dcee79 100644
--- a/arch/ia64/include/asm/checksum.h
+++ b/arch/ia64/include/asm/checksum.h
@@ -37,13 +37,14 @@ extern __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
*/
extern __wsum csum_partial(const void *buff, int len, __wsum sum);

+#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
/*
* Same as csum_partial, but copies from src while it checksums.
*
* Here it is even more important to align src and dst on a 32-bit (or
* even better 64-bit) boundary.
*/
-extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
+extern __wsum csum_and_copy_from_user(const void __user *src, void *dst,
int len, __wsum sum,
int *errp);

diff --git a/arch/ia64/lib/csum_partial_copy.c b/arch/ia64/lib/csum_partial_copy.c
index 9ab570d0f756..ab59eb399900 100644
--- a/arch/ia64/lib/csum_partial_copy.c
+++ b/arch/ia64/lib/csum_partial_copy.c
@@ -103,33 +103,23 @@ unsigned long do_csum_c(const unsigned char * buff, int len, unsigned int psum)
* This is very ugly but temporary. THIS NEEDS SERIOUS ENHANCEMENTS.
* But it's very tricky to get right even in C.
*/
-extern unsigned long do_csum(const unsigned char *, long);
-
__wsum
-csum_partial_copy_from_user(const void __user *src, void *dst,
+csum_and_copy_from_user(const void __user *src, void *dst,
int len, __wsum psum, int *errp)
{
- unsigned long result;
-
/* XXX Fixme
* for now we separate the copy from checksum for obvious
* alignment difficulties. Look at the Alpha code and you'll be
* scared.
*/

- if (__copy_from_user(dst, src, len) != 0 && errp)
+ if (copy_from_user(dst, src, len))
*errp = -EFAULT;

- result = do_csum(dst, len);
-
- /* add in old sum, and carry.. */
- result += (__force u32)psum;
- /* 32+c bits -> 32 bits */
- result = (result & 0xffffffff) + (result >> 32);
- return (__force __wsum)result;
+ return csum_partial(dst, len, psum);
}

-EXPORT_SYMBOL(csum_partial_copy_from_user);
+EXPORT_SYMBOL(csum_and_copy_from_user);

__wsum
csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
--
2.11.0