linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Dan Carpenter <dan.carpenter@oracle.com>,
	Jan Kara <jack@suse.cz>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 04/12] ext2: fix sleeping in atomic bugs on error
Date: Fri,  8 Oct 2021 13:27:52 +0200	[thread overview]
Message-ID: <20211008112714.743664351@linuxfoundation.org> (raw)
In-Reply-To: <20211008112714.601107695@linuxfoundation.org>

From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit 372d1f3e1bfede719864d0d1fbf3146b1e638c88 ]

The ext2_error() function syncs the filesystem so it sleeps.  The caller
is holding a spinlock so it's not allowed to sleep.

   ext2_statfs() <- disables preempt
   -> ext2_count_free_blocks()
      -> ext2_get_group_desc()

Fix this by using WARN() to print an error message and a stack trace
instead of using ext2_error().

Link: https://lore.kernel.org/r/20210921203233.GA16529@kili
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ext2/balloc.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/fs/ext2/balloc.c b/fs/ext2/balloc.c
index 33db13365c5e..fc59e0557e50 100644
--- a/fs/ext2/balloc.c
+++ b/fs/ext2/balloc.c
@@ -48,10 +48,9 @@ struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
 	struct ext2_sb_info *sbi = EXT2_SB(sb);
 
 	if (block_group >= sbi->s_groups_count) {
-		ext2_error (sb, "ext2_get_group_desc",
-			    "block_group >= groups_count - "
-			    "block_group = %d, groups_count = %lu",
-			    block_group, sbi->s_groups_count);
+		WARN(1, "block_group >= groups_count - "
+		     "block_group = %d, groups_count = %lu",
+		     block_group, sbi->s_groups_count);
 
 		return NULL;
 	}
@@ -59,10 +58,9 @@ struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
 	group_desc = block_group >> EXT2_DESC_PER_BLOCK_BITS(sb);
 	offset = block_group & (EXT2_DESC_PER_BLOCK(sb) - 1);
 	if (!sbi->s_group_desc[group_desc]) {
-		ext2_error (sb, "ext2_get_group_desc",
-			    "Group descriptor not loaded - "
-			    "block_group = %d, group_desc = %lu, desc = %lu",
-			     block_group, group_desc, offset);
+		WARN(1, "Group descriptor not loaded - "
+		     "block_group = %d, group_desc = %lu, desc = %lu",
+		      block_group, group_desc, offset);
 		return NULL;
 	}
 
-- 
2.33.0




  parent reply	other threads:[~2021-10-08 11:31 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-08 11:27 [PATCH 4.19 00/12] 4.19.210-rc1 review Greg Kroah-Hartman
2021-10-08 11:27 ` [PATCH 4.19 01/12] net: mdio: introduce a shutdown method to mdio device drivers Greg Kroah-Hartman
2021-10-08 11:27 ` [PATCH 4.19 02/12] xen-netback: correct success/error reporting for the SKB-with-fraglist case Greg Kroah-Hartman
2021-10-08 11:27 ` [PATCH 4.19 03/12] sparc64: fix pci_iounmap() when CONFIG_PCI is not set Greg Kroah-Hartman
2021-10-08 11:27 ` Greg Kroah-Hartman [this message]
2021-10-08 11:27 ` [PATCH 4.19 05/12] scsi: sd: Free scsi_disk device via put_device() Greg Kroah-Hartman
2021-10-08 11:27 ` [PATCH 4.19 06/12] usb: testusb: Fix for showing the connection speed Greg Kroah-Hartman
2021-10-08 11:27 ` [PATCH 4.19 07/12] usb: dwc2: check return value after calling platform_get_resource() Greg Kroah-Hartman
2021-10-08 11:27 ` [PATCH 4.19 08/12] selftests: be sure to make khdr before other targets Greg Kroah-Hartman
2021-10-08 11:27 ` [PATCH 4.19 09/12] scsi: ses: Retry failed Send/Receive Diagnostic commands Greg Kroah-Hartman
2021-10-08 11:27 ` [PATCH 4.19 10/12] tools/vm/page-types: remove dependency on opt_file for idle page tracking Greg Kroah-Hartman
2021-10-08 11:27 ` [PATCH 4.19 11/12] libata: Add ATA_HORKAGE_NO_NCQ_ON_ATI for Samsung 860 and 870 SSD Greg Kroah-Hartman
2021-10-08 11:28 ` [PATCH 4.19 12/12] lib/timerqueue: Rely on rbtree semantics for next timer Greg Kroah-Hartman
2021-10-08 20:47 ` [PATCH 4.19 00/12] 4.19.210-rc1 review Pavel Machek
2021-10-08 20:48 ` Shuah Khan
2021-10-08 21:03 ` Guenter Roeck
2021-10-09 17:41 ` Naresh Kamboju
2021-10-11  7:28   ` Richard Palethorpe
2021-10-11  1:37 ` Samuel Zou

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20211008112714.743664351@linuxfoundation.org \
    --to=gregkh@linuxfoundation.org \
    --cc=dan.carpenter@oracle.com \
    --cc=jack@suse.cz \
    --cc=linux-kernel@vger.kernel.org \
    --cc=sashal@kernel.org \
    --cc=stable@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).