af_unix: Use offsetof() instead of sizeof().

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The length of the AF_UNIX socket address contains an offset to the member
sun_path of struct sockaddr_un.

Currently, the preceding member is just sun_family, and its type is
sa_family_t and resolved to short.  Therefore, the offset is represented by
sizeof(short).  However, it is not clear and fragile to changes in struct
sockaddr_storage or sockaddr_un.

This commit makes it clear and robust by rewriting sizeof() with
offsetof().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Kuniyuki Iwashima 2021-11-24 11:14:19 +09:00 • committed by Jakub Kicinski

parent 442b03c32c

commit 755662ce78

2 changed files with 14 additions and 8 deletions

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19

net/unix/af_unix.c

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3

net/unix/diag.c

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