From: Andrew Morton <akpm@osdl.org>
Date: Mon, 10 Jul 2006 11:44:20 +0000 (-0700)
Subject: [PATCH] md: fix oops in error-handling
X-Git-Tag: Ubuntu-5.4-5.4.0-11.14~50556
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=d0a0a5ee7a0094231a11cfe3f86d2d8f5f994e01;p=mirror_ubuntu-focal-kernel.git

[PATCH] md: fix oops in error-handling

During early MD setup (superblock reading), we don't have a personality yet.
But the error-handling code tries to dereference mddev->pers.  Fix.

Acked-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/md/md.c b/drivers/md/md.c
index a5286beddcf5..b6d16022a53e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4592,6 +4592,8 @@ void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
 		__builtin_return_address(0),__builtin_return_address(1),
 		__builtin_return_address(2),__builtin_return_address(3));
 */
+	if (!mddev->pers)
+		return;
 	if (!mddev->pers->error_handler)
 		return;
 	mddev->pers->error_handler(mddev,rdev);