linux-kernel - [PATCH] xfs: Fix wrong error codes being returned

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Message-Id: <1398074687-26548-1-git-send-email-tuomas.tynkkynen@iki.fi>
Date:	Mon, 21 Apr 2014 13:04:47 +0300
From:	Tuomas Tynkkynen <tuomas.tynkkynen@....fi>
To:	Dave Chinner <david@...morbit.com>
Cc:	xfs@....sgi.com, linux-kernel@...r.kernel.org,
	Tuomas Tynkkynen <tuomas.tynkkynen@....fi>
Subject: [PATCH] xfs: Fix wrong error codes being returned

xfs_{compat_,}attrmulti_by_handle could return an errno with incorrect
sign in some cases. While at it, make sure ENOMEM is returned instead of
E2BIG if kmalloc fails.

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@....fi>
---
Compile tested only. For the ERANGE case, I also wonder if it should
be assigning to ops[i].am_error instead of error, and/or have a break.

 fs/xfs/xfs_ioctl.c   |    5 +++--
 fs/xfs/xfs_ioctl32.c |    5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 0b18776..2d8f4fd 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -543,10 +543,11 @@ xfs_attrmulti_by_handle(
 
 	ops = memdup_user(am_hreq.ops, size);
 	if (IS_ERR(ops)) {
-		error = PTR_ERR(ops);
+		error = -PTR_ERR(ops);
 		goto out_dput;
 	}
 
+	error = ENOMEM;
 	attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
 	if (!attr_name)
 		goto out_kfree_ops;
@@ -556,7 +557,7 @@ xfs_attrmulti_by_handle(
 		ops[i].am_error = strncpy_from_user((char *)attr_name,
 				ops[i].am_attrname, MAXNAMELEN);
 		if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
-			error = -ERANGE;
+			error = ERANGE;
 		if (ops[i].am_error < 0)
 			break;
 
diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index a7992f8..944d5ba 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -424,10 +424,11 @@ xfs_compat_attrmulti_by_handle(
 
 	ops = memdup_user(compat_ptr(am_hreq.ops), size);
 	if (IS_ERR(ops)) {
-		error = PTR_ERR(ops);
+		error = -PTR_ERR(ops);
 		goto out_dput;
 	}
 
+	error = ENOMEM;
 	attr_name = kmalloc(MAXNAMELEN, GFP_KERNEL);
 	if (!attr_name)
 		goto out_kfree_ops;
@@ -438,7 +439,7 @@ xfs_compat_attrmulti_by_handle(
 				compat_ptr(ops[i].am_attrname),
 				MAXNAMELEN);
 		if (ops[i].am_error == 0 || ops[i].am_error == MAXNAMELEN)
-			error = -ERANGE;
+			error = ERANGE;
 		if (ops[i].am_error < 0)
 			break;
 
-- 
1.7.9.5

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