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kernel-2.6.18-238.el5.src.rpm

From: Jeff Layton <jlayton@redhat.com>
Date: Mon, 26 Oct 2009 15:54:23 -0400
Subject: [cifs] fix oplock request handling in posix codepath
Message-id: <1256572464-27293-9-git-send-email-jlayton@redhat.com>
Patchwork-id: 21218
O-Subject: [RHEL5.5 PATCH 8/9] BZ#531005: cifs: fix oplock request handling in
	posix codepath
Bugzilla: 531005
RH-Acked-by: Steve Dickson <SteveD@redhat.com>
RH-Acked-by: Peter Staubach <staubach@redhat.com>

cifs_posix_open takes a "poplock" argument that's intended to be used in
the actual posix open call to set the "Flags" field. It ignores this
value however and declares an "oplock" parameter on the stack that it
passes uninitialized to the CIFSPOSIXOpen function. Not only does this
mean that the oplock request flags are bogus, but the result that's
expected to be in that variable is unchanged.

Fix this, and also clean up the type of the oplock parameter used. Since
it's expected to be __u32, we should use that everywhere and not
implicitly cast it from a signed type.

Signed-off-by: Jeff Layton <jlayton@redhat.com>

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 216ad5d..3bb70b4 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -116,7 +116,7 @@ extern __le64 cnvrtDosCifsTm(__u16 date, __u16 time);
 
 extern int cifs_posix_open(char *full_path, struct inode **pinode,
 			   struct super_block *sb, int mode, int oflags,
-			   int *poplock, __u16 *pnetfid, int xid);
+			   __u32 *poplock, __u16 *pnetfid, int xid);
 extern void posix_fill_in_inode(struct inode *tmp_inode,
 				FILE_UNIX_BASIC_INFO *pData, int isNewInode);
 extern struct inode *cifs_new_inode(struct super_block *sb, __u64 *inum);
diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index a24bc54..2bb9b51 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -137,10 +137,9 @@ cifs_bp_rename_retry:
 
 int cifs_posix_open(char *full_path, struct inode **pinode,
 		    struct super_block *sb, int mode, int oflags,
-		    int *poplock, __u16 *pnetfid, int xid)
+		    __u32 *poplock, __u16 *pnetfid, int xid)
 {
 	int rc;
-	__u32 oplock;
 	FILE_UNIX_BASIC_INFO *presp_data;
 	__u32 posix_flags = 0;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
@@ -180,7 +179,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
 
 
 	rc = CIFSPOSIXCreate(xid, cifs_sb->tcon, posix_flags, mode,
-			pnetfid, presp_data, &oplock, full_path,
+			pnetfid, presp_data, poplock, full_path,
 			cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
 					CIFS_MOUNT_MAP_SPECIAL_CHR);
 	if (rc)
@@ -231,7 +230,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 	int rc = -ENOENT;
 	int xid;
 	int create_options = CREATE_NOT_DIR;
-	int oplock = 0;
+	__u32 oplock = 0;
 	int oflags;
 	/*
 	 * BB below access is probably too much for mknod to request
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 1e677fb..6ecd969 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -138,9 +138,11 @@ static inline int cifs_get_disposition(unsigned int flags)
 }
 
 /* all arguments to this function must be checked for validity in caller */
-static inline int cifs_posix_open_inode_helper(struct inode *inode,
-			struct file *file, struct cifsInodeInfo *pCifsInode,
-			struct cifsFileInfo *pCifsFile, int oplock, u16 netfid)
+static inline int
+cifs_posix_open_inode_helper(struct inode *inode, struct file *file,
+			     struct cifsInodeInfo *pCifsInode,
+			     struct cifsFileInfo *pCifsFile, __u32 oplock,
+			     u16 netfid)
 {
 	struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 /*	struct timespec temp; */   /* BB REMOVEME BB */
@@ -280,7 +282,8 @@ client_can_cache:
 int cifs_open(struct inode *inode, struct file *file)
 {
 	int rc = -EACCES;
-	int xid, oplock;
+	int xid;
+	__u32 oplock;
 	struct cifs_sb_info *cifs_sb;
 	struct cifsTconInfo *tcon;
 	struct cifsFileInfo *pCifsFile;
@@ -496,7 +499,8 @@ static int cifs_relock_file(struct cifsFileInfo *cifsFile)
 static int cifs_reopen_file(struct file *file, bool can_flush)
 {
 	int rc = -EACCES;
-	int xid, oplock;
+	int xid;
+	__u32 oplock;
 	struct cifs_sb_info *cifs_sb;
 	struct cifsTconInfo *tcon;
 	struct cifsFileInfo *pCifsFile;