diff options
| author | Jaegeuk Kim <jaegeuk@kernel.org> | 2015-04-15 13:49:55 -0700 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2015-04-16 09:45:40 -0700 |
| commit | feb7cbb079e63ebb7c0bd7022d2ba9c1dd15c69b (patch) | |
| tree | 279b5dcd63730d042ef2cda231d115f703fa14e9 | |
| parent | d0cae97cb600d84a7e00df6f83ab3b2f60d8d7f7 (diff) | |
f2fs: avoid abnormal behavior on broken symlink
When f2fs_symlink was triggered and checkpoint was done before syncing its
link path, f2fs can get broken symlink like "xxx -> \0\0\0".
This incurs abnormal path_walk by VFS.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
| -rw-r--r-- | fs/f2fs/namei.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c index 9f0eec4677fe..407dde3d7a92 100644 --- a/fs/f2fs/namei.c +++ b/fs/f2fs/namei.c @@ -14,6 +14,7 @@ #include <linux/sched.h> #include <linux/ctype.h> #include <linux/dcache.h> +#include <linux/namei.h> #include "f2fs.h" #include "node.h" @@ -295,6 +296,23 @@ fail: return err; } +static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + struct page *page; + + page = page_follow_link_light(dentry, nd); + if (IS_ERR(page)) + return page; + + /* this is broken symlink case */ + if (*nd_get_link(nd) == 0) { + kunmap(page); + page_cache_release(page); + return ERR_PTR(-ENOENT); + } + return page; +} + static int f2fs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) { @@ -790,7 +808,7 @@ const struct inode_operations f2fs_dir_inode_operations = { const struct inode_operations f2fs_symlink_inode_operations = { .readlink = generic_readlink, - .follow_link = page_follow_link_light, + .follow_link = f2fs_follow_link, .put_link = page_put_link, .getattr = f2fs_getattr, .setattr = f2fs_setattr, |