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fs: NULL dereference in posix_acl_to_xattr()

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commit 47ba973440 upstream.

This patch moves the dereference of "buffer" after the check for NULL.
The only place which passes a NULL parameter is gfs2_set_acl().

Change-Id: I7ede500c05e646e4c07238d159b8f182a1fbf80d
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2014-02-14 12:05:49 +03:00 committed by surblazer
parent b8e7518373
commit a3a7bc82f0
1 changed files with 3 additions and 2 deletions
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3
fs/posix_acl.c
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@ -686,7 +686,7 @@ posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl,
void *buffer, size_t size)
{
posix_acl_xattr_header *ext_acl = (posix_acl_xattr_header *)buffer;
posix_acl_xattr_entry *ext_entry = ext_acl->a_entries;
posix_acl_xattr_entry *ext_entry;
int real_size, n;
real_size = posix_acl_xattr_size(acl->a_count);
@ -695,6 +695,7 @@ posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl,
if (real_size > size)
return -ERANGE;
ext_entry = ext_acl->a_entries;
ext_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION);
for (n=0; n < acl->a_count; n++, ext_entry++) {