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authorMikulas Patocka <mikulas@twibright.com>2016-05-24 22:48:33 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-28 16:50:24 -0700
commit01d6e08711bf90bc4d7ead14a93a0cbd73b1896a (patch)
treea1bcc6a8ef936e0a19beef7f7befc843f1c07224
parent44d51706b4685f965cd32acde3fe0fcc1e6198e8 (diff)
affs: fix remount failure when there are no options changed
Commit c8f33d0bec99 ("affs: kstrdup() 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: c8f33d0bec99 ("affs: kstrdup() memory handling") Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Cc: stable@vger.kernel.org # v4.1+ Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/affs/super.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/affs/super.c b/fs/affs/super.c
index 2a6713b6b9f4..d6384863192c 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -528,7 +528,7 @@ affs_remount(struct super_block *sb, int *flags, char *data)
char *prefix = NULL;
new_opts = kstrdup(data, GFP_KERNEL);
- if (!new_opts)
+ if (data && !new_opts)
return -ENOMEM;
pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
@@ -546,7 +546,8 @@ affs_remount(struct super_block *sb, int *flags, char *data)
}
flush_delayed_work(&sbi->sb_work);
- replace_mount_options(sb, new_opts);
+ if (new_opts)
+ replace_mount_options(sb, new_opts);
sbi->s_flags = mount_flags;
sbi->s_mode = mode;

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