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[3.19.y-ckt,stable] Patch "hpfs: fix remount failure when there are no options changed" has been added to the 3.19.y-ckt tree

Message ID 1467838876-18849-1-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa July 6, 2016, 9:01 p.m. UTC 
This is a note to let you know that I have just added a patch titled

    hpfs: fix remount failure when there are no options changed

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    https://git.launchpad.net/~canonical-kernel/linux/+git/linux-stable-ckt/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt23.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

From 6f171d6be54992834306f6d364165ad5271e3b39 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mikulas@twibright.com>
Date: Tue, 24 May 2016 22:47:00 +0200
Subject: hpfs: fix remount failure when there are no options changed

commit 44d51706b4685f965cd32acde3fe0fcc1e6198e8 upstream.

Commit ce657611baf9 ("hpfs: kstrdup() out of memory handling") checks if
the kstrdup function returns NULL due to out-of-memory condition.

However, if we are remounting a filesystem with no change to
filesystem-specific options, the parameter data is NULL.  In this case,
kstrdup returns NULL (because it was passed NULL parameter), although no
out of memory condition exists.  The mount syscall then fails with
ENOMEM.

This patch fixes the bug.  We fail with ENOMEM only if data is non-NULL.

The patch also changes the call to replace_mount_options - if we didn't
pass any filesystem-specific options, we don't call
replace_mount_options (thus we don't erase existing reported options).

Fixes: ce657611baf9 ("hpfs: kstrdup() out of memory handling")
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 fs/hpfs/super.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--
2.7.4
diff mbox

Patch

diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 8685c65..03b2c9c 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -428,7 +428,7 @@  static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
 	struct hpfs_sb_info *sbi = hpfs_sb(s);
 	char *new_opts = kstrdup(data, GFP_KERNEL);

-	if (!new_opts)
+	if (data && !new_opts)
 		return -ENOMEM;

 	sync_filesystem(s);
@@ -466,7 +466,8 @@  static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)

 	if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);

-	replace_mount_options(s, new_opts);
+	if (new_opts)
+		replace_mount_options(s, new_opts);

 	hpfs_unlock(s);
 	return 0;