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authorRichard Weinberger <richard@nod.at>2016-10-19 12:43:07 +0200
committerRichard Weinberger <richard@nod.at>2016-10-20 00:06:11 +0200
commitc83ed4c9dbb358b9e7707486e167e940d48bfeed (patch)
tree89f1cd092e2b89f71407cdf784d3e5b7c95d1f68
parent884a3b647809cb31cf6bd948f814e93753b38502 (diff)
ubifs: Abort readdir upon error
If UBIFS is facing an error while walking a directory, it reports this error and ubifs_readdir() returns the error code. But the VFS readdir logic does not make the getdents system call fail in all cases. When the readdir cursor indicates that more entries are present, the system call will just return and the libc wrapper will try again since it also knows that more entries are present. This causes the libc wrapper to busy loop for ever when a directory is corrupted on UBIFS. A common approach do deal with corrupted directory entries is skipping them by setting the cursor to the next entry. On UBIFS this approach is not possible since we cannot compute the next directory entry cursor position without reading the current entry. So all we can do is setting the cursor to the "no more entries" position and make getdents exit. Cc: stable@vger.kernel.org Signed-off-by: Richard Weinberger <richard@nod.at>
-rw-r--r--fs/ubifs/dir.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 668ec3b90ea1..bd4a5e8ce441 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -439,7 +439,7 @@ static unsigned int vfs_dent_type(uint8_t type)
*/
static int ubifs_readdir(struct file *file, struct dir_context *ctx)
{
- int err;
+ int err = 0;
struct qstr nm;
union ubifs_key key;
struct ubifs_dent_node *dent;
@@ -541,14 +541,12 @@ out:
kfree(file->private_data);
file->private_data = NULL;
- if (err != -ENOENT) {
+ if (err != -ENOENT)
ubifs_err(c, "cannot find next direntry, error %d", err);
- return err;
- }
/* 2 is a special value indicating that there are no more direntries */
ctx->pos = 2;
- return 0;
+ return err;
}
/* Free saved readdir() state when the directory is closed */