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| author | David Howells <dhowells@redhat.com> | 2022-03-11 13:23:46 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-16 14:26:50 +0100 |
| commit | 70bbc08533ab38c0889b0a001106b62699f38874 (patch) | |
| tree | 04c09f4a935dd114d465b8a760a0014764476cbf | |
| parent | eef9afda9a16328beb562e09ba2d19f8ec0713eb (diff) | |
| download | linux-stable-70bbc08533ab38c0889b0a001106b62699f38874.tar.gz linux-stable-70bbc08533ab38c0889b0a001106b62699f38874.tar.bz2 linux-stable-70bbc08533ab38c0889b0a001106b62699f38874.zip | |
watch_queue: Fix to release page in ->release()
commit c1853fbadcba1497f4907971e7107888e0714c81 upstream.
When a pipe ring descriptor points to a notification message, the
refcount on the backing page is incremented by the generic get function,
but the release function, which marks the bitmap, doesn't drop the page
ref.
Fix this by calling generic_pipe_buf_release() at the end of
watch_queue_pipe_buf_release().
Fixes: c73be61cede5 ("pipe: Add general notification queue support")
Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/watch_queue.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/watch_queue.c b/kernel/watch_queue.c index 427b0318e303..dfb3a7e28280 100644 --- a/kernel/watch_queue.c +++ b/kernel/watch_queue.c @@ -54,6 +54,7 @@ static void watch_queue_pipe_buf_release(struct pipe_inode_info *pipe, bit += page->index; set_bit(bit, wqueue->notes_bitmap); + generic_pipe_buf_release(pipe, buf); } // No try_steal function => no stealing |