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authorJani Nikula <jani.nikula@intel.com>2020-12-15 20:45:50 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-15 22:46:18 -0800
commit6f8f25440d791855e8b6a26cd2bff9d738468416 (patch)
treec928022395a345d497887a0b19eab56b4e93608a /kernel/relay.c
parent3d03295a7e9194c2318977b44999972ce3609664 (diff)
downloadlinux-6f8f25440d791855e8b6a26cd2bff9d738468416.tar.bz2
relay: require non-NULL callbacks in relay_open()
There are no clients passing NULL callbacks, which makes sense as it wouldn't even create a file. Require non-NULL callbacks, and throw away the handling for NULL callbacks. Link: https://lkml.kernel.org/r/e40642f3b027d2bb6bc851ddb60e0a61ea51f5f8.1606153547.git.jani.nikula@intel.com Signed-off-by: Jani Nikula <jani.nikula@intel.com> Suggested-by: Christoph Hellwig <hch@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Jens Axboe <axboe@kernel.dk> Cc: Kalle Valo <kvalo@codeaurora.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/relay.c')
-rw-r--r--kernel/relay.c14
1 files changed, 2 insertions, 12 deletions
diff --git a/kernel/relay.c b/kernel/relay.c
index b51343642bf4..d9b8185161a8 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -291,13 +291,6 @@ static int remove_buf_file_default_callback(struct dentry *dentry)
return -EINVAL;
}
-/* relay channel default callbacks */
-static struct rchan_callbacks default_channel_callbacks = {
- .subbuf_start = subbuf_start_default_callback,
- .create_buf_file = create_buf_file_default_callback,
- .remove_buf_file = remove_buf_file_default_callback,
-};
-
/**
* wakeup_readers - wake up readers waiting on a channel
* @work: contains the channel buffer
@@ -472,11 +465,6 @@ static void relay_close_buf(struct rchan_buf *buf)
static void setup_callbacks(struct rchan *chan,
struct rchan_callbacks *cb)
{
- if (!cb) {
- chan->cb = &default_channel_callbacks;
- return;
- }
-
if (!cb->subbuf_start)
cb->subbuf_start = subbuf_start_default_callback;
if (!cb->create_buf_file)
@@ -542,6 +530,8 @@ struct rchan *relay_open(const char *base_filename,
return NULL;
if (subbuf_size > UINT_MAX / n_subbufs)
return NULL;
+ if (!cb)
+ return NULL;
chan = kzalloc(sizeof(struct rchan), GFP_KERNEL);
if (!chan)