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| author | Davidlohr Bueso <dave@stgolabs.net> | 2015-11-06 16:33:04 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-06 17:50:42 -0800 |
| commit | 5f2a2d5d423d5337a1392fa016ec23a8a4206006 (patch) | |
| tree | 644e89ea4f70339d6b8f3dddc76132a1f90f8e62 /ipc | |
| parent | cb7ae262e230064ba282094b7e1f60a092448b72 (diff) | |
| download | lwn-5f2a2d5d423d5337a1392fa016ec23a8a4206006.tar.gz lwn-5f2a2d5d423d5337a1392fa016ec23a8a4206006.zip | |
ipc,msg: drop dst nil validation in copy_msg
d0edd8528362 ("ipc: convert invalid scenarios to use WARN_ON") relaxed the
nil dst parameter check, originally being a full BUG_ON. However, this
check seems quite unnecessary when the only purpose is for
ceckpoint/restore (MSG_COPY flag):
o The copy variable is set initially to nil, apparently as a way of
ensuring that prepare_copy is previously called. Which is in fact done,
unconditionally at the beginning of do_msgrcv.
o There is no concurrency with 'copy' (stack allocated in do_msgrcv).
Furthermore, any errors in 'copy' (and thus prepare_copy/copy_msg) should
always handled by IS_ERR() family. Therefore remove this check altogether
as it can never occur with the current users.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
| -rw-r--r-- | ipc/msgutil.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/ipc/msgutil.c b/ipc/msgutil.c index 71f448e5e927..ed81aafd2392 100644 --- a/ipc/msgutil.c +++ b/ipc/msgutil.c @@ -123,7 +123,6 @@ struct msg_msg *copy_msg(struct msg_msg *src, struct msg_msg *dst) size_t len = src->m_ts; size_t alen; - WARN_ON(dst == NULL); if (src->m_ts > dst->m_ts) return ERR_PTR(-EINVAL); |