From: David Howells <dhowells@redhat.com>
To: kernel test robot <lkp@intel.com>
Cc: dhowells@redhat.com, torvalds@linux-foundation.org,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Peter Zijlstra <peterz@infradead.org>,
nicolas.dichtel@6wind.com, raven@themaw.net,
Christian Brauner <christian@brauner.io>,
keyrings@vger.kernel.org, linux-usb@vger.kernel.org,
linux-block@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org,
linux-kernel@vger.kernel.org, lkp@lists.01.org
Subject: Re: [pipe] d60337eff1: BUG:kernel_NULL_pointer_dereference,address
Date: Fri, 15 Nov 2019 16:22:26 +0000 [thread overview]
Message-ID: <6853.1573834946@warthog.procyon.org.uk> (raw)
In-Reply-To: <9279.1573824532@warthog.procyon.org.uk>
Actually, no, this is the fix:
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 7006b5b2106d..be2fc5793ddd 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -537,7 +537,7 @@ static size_t push_pipe(struct iov_iter *i, size_t size,
buf->ops = &default_pipe_buf_ops;
buf->page = page;
buf->offset = 0;
- buf->len = max_t(ssize_t, left, PAGE_SIZE);
+ buf->len = min_t(ssize_t, left, PAGE_SIZE);
left -= buf->len;
iter_head++;
pipe->head = iter_head;
David
WARNING: multiple messages have this Message-ID (diff)
From: David Howells <dhowells@redhat.com>
To: lkp@lists.01.org
Subject: Re: [pipe] d60337eff1: BUG:kernel_NULL_pointer_dereference, address
Date: Fri, 15 Nov 2019 16:22:26 +0000 [thread overview]
Message-ID: <6853.1573834946@warthog.procyon.org.uk> (raw)
In-Reply-To: <9279.1573824532@warthog.procyon.org.uk>
[-- Attachment #1: Type: text/plain, Size: 496 bytes --]
Actually, no, this is the fix:
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 7006b5b2106d..be2fc5793ddd 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -537,7 +537,7 @@ static size_t push_pipe(struct iov_iter *i, size_t size,
buf->ops = &default_pipe_buf_ops;
buf->page = page;
buf->offset = 0;
- buf->len = max_t(ssize_t, left, PAGE_SIZE);
+ buf->len = min_t(ssize_t, left, PAGE_SIZE);
left -= buf->len;
iter_head++;
pipe->head = iter_head;
David
next prev parent reply other threads:[~2019-11-15 16:22 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-01 17:34 [RFC PATCH 00/11] pipe: Notification queue preparation [ver #3] David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` [RFC PATCH 01/11] pipe: Reduce #inclusion of pipe_fs_i.h " David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` [RFC PATCH 02/11] Remove the nr_exclusive argument from __wake_up_sync_key() " David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` [RFC PATCH 03/11] Add wake_up_interruptible_sync_poll_locked() " David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` [RFC PATCH 04/11] pipe: Use head and tail pointers for the ring, not cursor and length " David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` David Howells
2019-11-07 9:03 ` [pipe] d60337eff1: phoronix-test-suite.noise-level.0.activity_level 144.0% improvement lkp report check
2019-11-07 9:03 ` lkp report check
2019-11-07 9:03 ` lkp report check
2019-11-07 16:51 ` Linus Torvalds
2019-11-07 16:51 ` Linus Torvalds
2019-11-07 16:51 ` Linus Torvalds
2019-11-07 17:42 ` David Howells
2019-11-07 17:42 ` David Howells
2019-11-10 3:13 ` [pipe] d60337eff1: BUG:kernel_NULL_pointer_dereference,address kernel test robot
2019-11-10 3:13 ` kernel test robot
2019-11-10 3:13 ` kernel test robot
2019-11-15 13:28 ` David Howells
2019-11-15 13:28 ` [pipe] d60337eff1: BUG:kernel_NULL_pointer_dereference, address David Howells
2019-11-15 16:22 ` David Howells [this message]
2019-11-15 16:22 ` David Howells
2019-11-18 7:53 ` [LKP] Re: [pipe] d60337eff1: BUG:kernel_NULL_pointer_dereference,address kernel test robot
2019-11-18 7:53 ` [pipe] d60337eff1: BUG:kernel_NULL_pointer_dereference, address kernel test robot
2019-11-18 7:53 ` [LKP] Re: [pipe] d60337eff1: BUG:kernel_NULL_pointer_dereference,address kernel test robot
2019-11-01 17:34 ` [RFC PATCH 05/11] pipe: Allow pipes to have kernel-reserved slots [ver #3] David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` [RFC PATCH 06/11] pipe: Advance tail pointer inside of wait spinlock in pipe_read() " David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:34 ` David Howells
2019-11-01 17:35 ` [RFC PATCH 07/11] pipe: Conditionalise wakeup " David Howells
2019-11-01 17:35 ` David Howells
2019-11-01 17:35 ` David Howells
2019-11-01 17:35 ` [RFC PATCH 08/11] pipe: Rearrange sequence in pipe_write() to preallocate slot " David Howells
2019-11-01 17:35 ` David Howells
2019-11-01 17:35 ` David Howells
2019-11-01 17:35 ` [RFC PATCH 09/11] pipe: Remove redundant wakeup from pipe_write() " David Howells
2019-11-01 17:35 ` David Howells
2019-11-01 17:35 ` David Howells
2019-11-01 17:35 ` [RFC PATCH 10/11] pipe: Check for ring full inside of the spinlock in " David Howells
2019-11-01 17:35 ` David Howells
2019-11-01 17:35 ` David Howells
2019-11-01 17:35 ` [RFC PATCH 11/11] pipe: Increase the writer-wakeup threshold to reduce context-switch count " David Howells
2019-11-01 17:35 ` David Howells
2019-11-01 17:35 ` David Howells
2019-11-01 19:24 ` [RFC PATCH 00/11] pipe: Notification queue preparation " Linus Torvalds
2019-11-01 19:24 ` Linus Torvalds
2019-11-01 22:05 ` David Howells
2019-11-01 22:12 ` Linus Torvalds
2019-11-01 22:12 ` Linus Torvalds
2019-11-05 16:02 ` Details on the UAPI of implementing notifications on pipes David Howells
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