Commit b66de7d0 authored by Eric Sandeen's avatar Eric Sandeen Committed by Sasha Levin

xfs: only return -errno or success from attr ->put_listent

[ Upstream commit 2a6fba6d ]

Today, the put_listent formatters return either 1 or 0; if
they return 1, some callers treat this as an error and return
it up the stack, despite "1" not being a valid (negative)
error code.

The intent seems to be that if the input buffer is full,
we set seen_enough or set count = -1, and return 1;
but some callers check the return before checking the
seen_enough or count fields of the context.

Fix this by only returning non-zero for actual errors
encountered, and rely on the caller to first check the
return value, then check the values in the context to
decide what to do.
Signed-off-by: default avatarEric Sandeen <sandeen@redhat.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 49607e63
......@@ -112,6 +112,7 @@ typedef struct attrlist_cursor_kern {
*========================================================================*/
/* Return 0 on success, or -errno; other state communicated via *context */
typedef int (*put_listent_func_t)(struct xfs_attr_list_context *, int,
unsigned char *, int, int, unsigned char *);
......
......@@ -108,16 +108,14 @@ xfs_attr_shortform_list(xfs_attr_list_context_t *context)
(int)sfe->namelen,
(int)sfe->valuelen,
&sfe->nameval[sfe->namelen]);
if (error)
return error;
/*
* Either search callback finished early or
* didn't fit it all in the buffer after all.
*/
if (context->seen_enough)
break;
if (error)
return error;
sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
}
trace_xfs_attr_list_sf_all(context);
......@@ -581,7 +579,7 @@ xfs_attr_put_listent(
trace_xfs_attr_list_full(context);
alist->al_more = 1;
context->seen_enough = 1;
return 1;
return 0;
}
aep = (attrlist_ent_t *)&context->alist[context->firstu];
......
......@@ -151,7 +151,7 @@ xfs_xattr_put_listent(
arraytop = context->count + prefix_len + namelen + 1;
if (arraytop > context->firstu) {
context->count = -1; /* insufficient space */
return 1;
return 0;
}
offset = (char *)context->alist + context->count;
strncpy(offset, xfs_xattr_prefix(flags), prefix_len);
......@@ -193,12 +193,15 @@ list_one_attr(const char *name, const size_t len, void *data,
}
ssize_t
xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
xfs_vn_listxattr(
struct dentry *dentry,
char *data,
size_t size)
{
struct xfs_attr_list_context context;
struct attrlist_cursor_kern cursor = { 0 };
struct inode *inode = d_inode(dentry);
int error;
struct inode *inode = d_inode(dentry);
int error;
/*
* First read the regular on-disk attributes.
......@@ -216,7 +219,9 @@ xfs_vn_listxattr(struct dentry *dentry, char *data, size_t size)
else
context.put_listent = xfs_xattr_put_listent_sizes;
xfs_attr_list_int(&context);
error = xfs_attr_list_int(&context);
if (error)
return error;
if (context.count < 0)
return -ERANGE;
......
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