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| author | Ingo Molnar <mingo@elte.hu> | 2009-04-07 14:16:50 +0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-07 07:39:59 -0700 |
| commit | f8201abcb2badce7eaa6a3715f9a228cfd88a453 (patch) | |
| tree | b635d8ad39ada141b06884e91ad7de41c44a2f0e /fs/ramfs | |
| parent | 4ef4327b30957a16619ac7d47c749465e62de8c3 (diff) | |
| download | linux-f8201abcb2badce7eaa6a3715f9a228cfd88a453.tar.gz | |
ramfs: fix double freeing s_fs_info on failed mount
If ramfs mount fails, s_fs_info will be freed twice in ramfs_fill_super() and ramfs_kill_sb(), leading to kernel oops. Consolidate and beautify the code. Make sure s_fs_info and s_root are in known good states. Acked-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ramfs')
| -rw-r--r-- | fs/ramfs/inode.c | 19 |
1 files changed, 11 insertions, 8 deletions
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c index a404fb88e456..3a6b193d8444 100644 --- a/fs/ramfs/inode.c +++ b/fs/ramfs/inode.c @@ -221,22 +221,23 @@ static int ramfs_fill_super(struct super_block * sb, void * data, int silent) save_mount_options(sb, data); fsi = kzalloc(sizeof(struct ramfs_fs_info), GFP_KERNEL); + sb->s_fs_info = fsi; if (!fsi) { err = -ENOMEM; goto fail; } - sb->s_fs_info = fsi; err = ramfs_parse_options(data, &fsi->mount_opts); if (err) goto fail; - sb->s_maxbytes = MAX_LFS_FILESIZE; - sb->s_blocksize = PAGE_CACHE_SIZE; - sb->s_blocksize_bits = PAGE_CACHE_SHIFT; - sb->s_magic = RAMFS_MAGIC; - sb->s_op = &ramfs_ops; - sb->s_time_gran = 1; + sb->s_maxbytes = MAX_LFS_FILESIZE; + sb->s_blocksize = PAGE_CACHE_SIZE; + sb->s_blocksize_bits = PAGE_CACHE_SHIFT; + sb->s_magic = RAMFS_MAGIC; + sb->s_op = &ramfs_ops; + sb->s_time_gran = 1; + inode = ramfs_get_inode(sb, S_IFDIR | fsi->mount_opts.mode, 0); if (!inode) { err = -ENOMEM; @@ -244,14 +245,16 @@ static int ramfs_fill_super(struct super_block * sb, void * data, int silent) } root = d_alloc_root(inode); + sb->s_root = root; if (!root) { err = -ENOMEM; goto fail; } - sb->s_root = root; + return 0; fail: kfree(fsi); + sb->s_fs_info = NULL; iput(inode); return err; } |