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net: remove sockptr_advance

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sockptr_advance never properly worked.  Replace it with _offset variants
of copy_from_sockptr and copy_to_sockptr.

Fixes: ba423fdaa5 ("net: add a new sockptr_t type")
Reported-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reported-by: Ido Schimmel <idosch@idosch.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
Tested-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig
2020-07-28 18:38:35 +02:00
committed by David S. Miller
parent 035bfd051e
commit d3c4815151
10 changed files with 49 additions and 48 deletions
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27
include/linux/sockptr.h
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@@ -69,19 +69,26 @@ static inline bool sockptr_is_null(sockptr_t sockptr)
return !sockptr.user;
}
static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
static inline int copy_from_sockptr_offset(void *dst, sockptr_t src,
size_t offset, size_t size)
{
if (!sockptr_is_kernel(src))
return copy_from_user(dst, src.user, size);
memcpy(dst, src.kernel, size);
return copy_from_user(dst, src.user + offset, size);
memcpy(dst, src.kernel + offset, size);
return 0;
}
static inline int copy_to_sockptr(sockptr_t dst, const void *src, size_t size)
static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
{
return copy_from_sockptr_offset(dst, src, 0, size);
}
static inline int copy_to_sockptr_offset(sockptr_t dst, size_t offset,
const void *src, size_t size)
{
if (!sockptr_is_kernel(dst))
return copy_to_user(dst.user, src, size);
memcpy(dst.kernel, src, size);
return copy_to_user(dst.user + offset, src, size);
memcpy(dst.kernel + offset, src, size);
return 0;
}
@@ -112,14 +119,6 @@ static inline void *memdup_sockptr_nul(sockptr_t src, size_t len)
return p;
}
static inline void sockptr_advance(sockptr_t sockptr, size_t len)
{
if (sockptr_is_kernel(sockptr))
sockptr.kernel += len;
else
sockptr.user += len;
}
static inline long strncpy_from_sockptr(char *dst, sockptr_t src, size_t count)
{
if (sockptr_is_kernel(src)) {