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FAILED: patch "[PATCH] NFS: Fix memory leaks and corruption in readdir" failed to apply to 4.4-stable tree

PATCH [email protected] 1 participant 1 message Feb 9, 2020

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The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 4b310319c6a8ce708f1033d57145e2aa027a883c Mon Sep 17 00:00:00 2001
From: Trond Myklebust <[email protected]>
Date: Sun, 2 Feb 2020 17:53:53 -0500
Subject: [PATCH] NFS: Fix memory leaks and corruption in readdir

nfs_readdir_xdr_to_array() must not exit without having initialised the array, so that the page cache deletion routines can safely call nfs_readdir_clear_array().
Furthermore, we should ensure that if we exit nfs_readdir_filler() with an error, we free up any page contents to prevent a leak if we try to fill the page again.

Fixes 11de3b11e08c ("NFS: Fix a memory leak in nfs_readdir")
Cc [email protected] # v2.6.37+
Signed-off-by Trond Myklebust <[email protected]>
Reviewed-by Benjamin Coddington <[email protected]>
Signed-off-by Anna Schumaker <[email protected]>
fs/nfs/dir.c +15 -2
index 6427a8a8d61a..451c48cdb1c2 100644
@@ -162,6 +162,17 @@ typedef struct {
 	bool eof;
 } nfs_readdir_descriptor_t;
 
+static
+void nfs_readdir_init_array(struct page *page)
+{
+	struct nfs_cache_array *array;
+
+	array = kmap_atomic(page);
+	memset(array, 0, sizeof(struct nfs_cache_array));
+	array->eof_index = -1;
+	kunmap_atomic(array);
+}
+
 /*
  * we are freeing strings created by nfs_add_to_readdir_array()
  */

@@ -174,6 +185,7 @@ void nfs_readdir_clear_array(struct page *page)
 	array = kmap_atomic(page);
 	for (i = 0; i < array->size; i++)
 		kfree(array->array[i].string.name);
+	array->size = 0;
 	kunmap_atomic(array);
 }
 

@@ -610,6 +622,8 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
 	int status = -ENOMEM;
 	unsigned int array_size = ARRAY_SIZE(pages);
 
+	nfs_readdir_init_array(page);
+
 	entry.prev_cookie = 0;
 	entry.cookie = desc->last_cookie;
 	entry.eof = 0;

@@ -626,8 +640,6 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
 	}
 
 	array = kmap(page);
-	memset(array, 0, sizeof(struct nfs_cache_array));
-	array->eof_index = -1;
 
 	status = nfs_readdir_alloc_pages(pages, array_size);
 	if (status < 0)

@@ -682,6 +694,7 @@ int nfs_readdir_filler(void *data, struct page* page)
 	unlock_page(page);
 	return 0;
  error:
+	nfs_readdir_clear_array(page);
 	unlock_page(page);
 	return ret;
 }