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| author | Al Viro <viro@zeniv.linux.org.uk> | 2010-01-24 06:04:07 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2010-01-27 04:22:24 +0100 |
| commit | 29333920a5a46edcc9b728e2cf0134d5a9b516ee (patch) | |
| tree | 2991b9f6d82d43c712278d6364da4faad4a0180d /fs/affs/symlink.c | |
| parent | Fix a leak in affs_fill_super() (diff) | |
| download | linux-29333920a5a46edcc9b728e2cf0134d5a9b516ee.tar.xz linux-29333920a5a46edcc9b728e2cf0134d5a9b516ee.zip | |
Fix remount races with symlink handling in affs
A couple of fields in affs_sb_info is used in follow_link() and
symlink() for handling AFFS "absolute" symlinks. Need locking
against affs_remount() updates.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/affs/symlink.c')
| -rw-r--r-- | fs/affs/symlink.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/affs/symlink.c b/fs/affs/symlink.c index 41782539c907..ee00f08c4f53 100644 --- a/fs/affs/symlink.c +++ b/fs/affs/symlink.c @@ -20,7 +20,6 @@ static int affs_symlink_readpage(struct file *file, struct page *page) int i, j; char c; char lc; - char *pf; pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino); @@ -32,11 +31,15 @@ static int affs_symlink_readpage(struct file *file, struct page *page) j = 0; lf = (struct slink_front *)bh->b_data; lc = 0; - pf = AFFS_SB(inode->i_sb)->s_prefix ? AFFS_SB(inode->i_sb)->s_prefix : "/"; if (strchr(lf->symname,':')) { /* Handle assign or volume name */ + struct affs_sb_info *sbi = AFFS_SB(inode->i_sb); + char *pf; + spin_lock(&sbi->symlink_lock); + pf = sbi->s_prefix ? sbi->s_prefix : "/"; while (i < 1023 && (c = pf[i])) link[i++] = c; + spin_unlock(&sbi->symlink_lock); while (i < 1023 && lf->symname[j] != ':') link[i++] = lf->symname[j++]; if (i < 1023) |