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net: Comment copy_from_sockptr() explaining its behaviour

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copy_from_sockptr() has a history of misuse. Add a comment explaining that
the function follows API of copy_from_user(), i.e. returns 0 for success,
or number of bytes not copied on error.

Signed-off-by: Michal Luczaj <mhal@rbox.co>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Michal Luczaj 2024-11-19 14:31:43 +01:00 committed by Paolo Abeni
parent 0202005664
commit 49b2b97332
1 changed files with 2 additions and 0 deletions
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include/linux/sockptr.h
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@ -53,6 +53,8 @@ static inline int copy_from_sockptr_offset(void *dst, sockptr_t src,
/* Deprecated.
* This is unsafe, unless caller checked user provided optlen.
* Prefer copy_safe_from_sockptr() instead.
*
* Returns 0 for success, or number of bytes not copied on error.
*/
static inline int copy_from_sockptr(void *dst, sockptr_t src, size_t size)
{