1 files changed, 76 insertions, 142 deletions

diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 112a5fb0b27b..ba5537d4bc15 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -31,6 +31,7 @@
 #include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
 #include <linux/sched.h>
+#include <linux/crc-itu-t.h>
 
 static inline int udf_match(int len1, const char *name1, int len2,
 			    const char *name2)
@@ -97,25 +98,23 @@ int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
 		memset(fibh->ebh->b_data, 0x00, padlen + offset);
 	}
 
-	crc = udf_crc((uint8_t *)cfi + sizeof(tag),
-		      sizeof(struct fileIdentDesc) - sizeof(tag), 0);
+	crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(tag),
+		      sizeof(struct fileIdentDesc) - sizeof(tag));
 
 	if (fibh->sbh == fibh->ebh) {
-		crc = udf_crc((uint8_t *)sfi->impUse,
+		crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
 			      crclen + sizeof(tag) -
-			      sizeof(struct fileIdentDesc), crc);
+			      sizeof(struct fileIdentDesc));
 	} else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
-		crc = udf_crc(fibh->ebh->b_data +
+		crc = crc_itu_t(crc, fibh->ebh->b_data +
 					sizeof(struct fileIdentDesc) +
 					fibh->soffset,
 			      crclen + sizeof(tag) -
-					sizeof(struct fileIdentDesc),
-			      crc);
+					sizeof(struct fileIdentDesc));
 	} else {
-		crc = udf_crc((uint8_t *)sfi->impUse,
-			      -fibh->soffset - sizeof(struct fileIdentDesc),
-			      crc);
-		crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc);
+		crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
+			      -fibh->soffset - sizeof(struct fileIdentDesc));
+		crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
 	}
 
 	cfi->descTag.descCRC = cpu_to_le16(crc);
@@ -149,7 +148,7 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 	struct fileIdentDesc *fi = NULL;
 	loff_t f_pos;
 	int block, flen;
-	char fname[UDF_NAME_LEN];
+	char *fname = NULL;
 	char *nameptr;
 	uint8_t lfi;
 	uint16_t liu;
@@ -163,12 +162,12 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 	size = udf_ext0_offset(dir) + dir->i_size;
 	f_pos = udf_ext0_offset(dir);
 
+	fibh->sbh = fibh->ebh = NULL;
 	fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
-	if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
-		fibh->sbh = fibh->ebh = NULL;
-	else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
-			      &epos, &eloc, &elen, &offset) ==
-					(EXT_RECORDED_ALLOCATED >> 30)) {
+	if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+		if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
+		    &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30))
+			goto out_err;
 		block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 		if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 			if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
@@ -179,25 +178,19 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 			offset = 0;
 
 		fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
-		if (!fibh->sbh) {
-			brelse(epos.bh);
-			return NULL;
-		}
-	} else {
-		brelse(epos.bh);
-		return NULL;
+		if (!fibh->sbh)
+			goto out_err;
 	}
 
+	fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
+	if (!fname)
+		goto out_err;
+
 	while (f_pos < size) {
 		fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &epos, &eloc,
 					&elen, &offset);
-		if (!fi) {
-			if (fibh->sbh != fibh->ebh)
-				brelse(fibh->ebh);
-			brelse(fibh->sbh);
-			brelse(epos.bh);
-			return NULL;
-		}
+		if (!fi)
+			goto out_err;
 
 		liu = le16_to_cpu(cfi->lengthOfImpUse);
 		lfi = cfi->lengthFileIdent;
@@ -237,53 +230,22 @@ static struct fileIdentDesc *udf_find_entry(struct inode *dir,
 
 		flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
 		if (flen && udf_match(flen, fname, dentry->d_name.len,
-				      dentry->d_name.name)) {
-			brelse(epos.bh);
-			return fi;
-		}
+				      dentry->d_name.name))
+			goto out_ok;
 	}
 
+out_err:
+	fi = NULL;
 	if (fibh->sbh != fibh->ebh)
 		brelse(fibh->ebh);
 	brelse(fibh->sbh);
+out_ok:
 	brelse(epos.bh);
+	kfree(fname);
 
-	return NULL;
+	return fi;
 }
 
-/*
- * udf_lookup
- *
- * PURPOSE
- *	Look-up the inode for a given name.
- *
- * DESCRIPTION
- *	Required - lookup_dentry() will return -ENOTDIR if this routine is not
- *	available for a directory. The filesystem is useless if this routine is
- *	not available for at least the filesystem's root directory.
- *
- *	This routine is passed an incomplete dentry - it must be completed by
- *	calling d_add(dentry, inode). If the name does not exist, then the
- *	specified inode must be set to null. An error should only be returned
- *	when the lookup fails for a reason other than the name not existing.
- *	Note that the directory inode semaphore is held during the call.
- *
- *	Refer to lookup_dentry() in fs/namei.c
- *	lookup_dentry() -> lookup() -> real_lookup() -> .
- *
- * PRE-CONDITIONS
- *	dir			Pointer to inode of parent directory.
- *	dentry			Pointer to dentry to complete.
- *	nd			Pointer to lookup nameidata
- *
- * POST-CONDITIONS
- *	<return>		Zero on success.
- *
- * HISTORY
- *	July 1, 1997 - Andrew E. Mileski
- *	Written, tested, and released.
- */
-
 static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
 				 struct nameidata *nd)
 {
@@ -336,11 +298,9 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 {
 	struct super_block *sb = dir->i_sb;
 	struct fileIdentDesc *fi = NULL;
-	char name[UDF_NAME_LEN], fname[UDF_NAME_LEN];
+	char *name = NULL;
 	int namelen;
 	loff_t f_pos;
-	int flen;
-	char *nameptr;
 	loff_t size = udf_ext0_offset(dir) + dir->i_size;
 	int nfidlen;
 	uint8_t lfi;
@@ -352,16 +312,23 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 	struct extent_position epos = {};
 	struct udf_inode_info *dinfo;
 
+	fibh->sbh = fibh->ebh = NULL;
+	name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
+	if (!name) {
+		*err = -ENOMEM;
+		goto out_err;
+	}
+
 	if (dentry) {
 		if (!dentry->d_name.len) {
 			*err = -EINVAL;
-			return NULL;
+			goto out_err;
 		}
 		namelen = udf_put_filename(sb, dentry->d_name.name, name,
 						 dentry->d_name.len);
 		if (!namelen) {
 			*err = -ENAMETOOLONG;
-			return NULL;
+			goto out_err;
 		}
 	} else {
 		namelen = 0;
@@ -373,11 +340,14 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 
 	fibh->soffset = fibh->eoffset = f_pos & (dir->i_sb->s_blocksize - 1);
 	dinfo = UDF_I(dir);
-	if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
-		fibh->sbh = fibh->ebh = NULL;
-	else if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits,
-			      &epos, &eloc, &elen, &offset) ==
-					(EXT_RECORDED_ALLOCATED >> 30)) {
+	if (dinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+		if (inode_bmap(dir, f_pos >> dir->i_sb->s_blocksize_bits, &epos,
+		    &eloc, &elen, &offset) != (EXT_RECORDED_ALLOCATED >> 30)) {
+			block = udf_get_lb_pblock(dir->i_sb,
+					dinfo->i_location, 0);
+			fibh->soffset = fibh->eoffset = sb->s_blocksize;
+			goto add;
+		}
 		block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
 		if ((++offset << dir->i_sb->s_blocksize_bits) < elen) {
 			if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
@@ -389,17 +359,11 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 
 		fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block);
 		if (!fibh->sbh) {
-			brelse(epos.bh);
 			*err = -EIO;
-			return NULL;
+			goto out_err;
 		}
 
 		block = dinfo->i_location.logicalBlockNum;
-	} else {
-		block = udf_get_lb_pblock(dir->i_sb, dinfo->i_location, 0);
-		fibh->sbh = fibh->ebh = NULL;
-		fibh->soffset = fibh->eoffset = sb->s_blocksize;
-		goto add;
 	}
 
 	while (f_pos < size) {
@@ -407,41 +371,16 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 					&elen, &offset);
 
 		if (!fi) {
-			if (fibh->sbh != fibh->ebh)
-				brelse(fibh->ebh);
-			brelse(fibh->sbh);
-			brelse(epos.bh);
 			*err = -EIO;
-			return NULL;
+			goto out_err;
 		}
 
 		liu = le16_to_cpu(cfi->lengthOfImpUse);
 		lfi = cfi->lengthFileIdent;
 
-		if (fibh->sbh == fibh->ebh)
-			nameptr = fi->fileIdent + liu;
-		else {
-			int poffset;	/* Unpaded ending offset */
-
-			poffset = fibh->soffset + sizeof(struct fileIdentDesc) +
-					liu + lfi;
-
-			if (poffset >= lfi)
-				nameptr = (char *)(fibh->ebh->b_data +
-						   poffset - lfi);
-			else {
-				nameptr = fname;
-				memcpy(nameptr, fi->fileIdent + liu,
-					lfi - poffset);
-				memcpy(nameptr + lfi - poffset,
-					fibh->ebh->b_data, poffset);
-			}
-		}
-
 		if ((cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
 			if (((sizeof(struct fileIdentDesc) +
 					liu + lfi + 3) & ~3) == nfidlen) {
-				brelse(epos.bh);
 				cfi->descTag.tagSerialNum = cpu_to_le16(1);
 				cfi->fileVersionNum = cpu_to_le16(1);
 				cfi->fileCharacteristics = 0;
@@ -449,27 +388,13 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 				cfi->lengthOfImpUse = cpu_to_le16(0);
 				if (!udf_write_fi(dir, cfi, fi, fibh, NULL,
 						  name))
-					return fi;
+					goto out_ok;
 				else {
 					*err = -EIO;
-					return NULL;
+					goto out_err;
 				}
 			}
 		}
-
-		if (!lfi || !dentry)
-			continue;
-
-		flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi);
-		if (flen && udf_match(flen, fname, dentry->d_name.len,
-				      dentry->d_name.name)) {
-			if (fibh->sbh != fibh->ebh)
-				brelse(fibh->ebh);
-			brelse(fibh->sbh);
-			brelse(epos.bh);
-			*err = -EEXIST;
-			return NULL;
-		}
 	}
 
 add:
@@ -496,7 +421,7 @@ add:
 		fibh->sbh = fibh->ebh =
 				udf_expand_dir_adinicb(dir, &block, err);
 		if (!fibh->sbh)
-			return NULL;
+			goto out_err;
 		epos.block = dinfo->i_location;
 		epos.offset = udf_file_entry_alloc_offset(dir);
 		/* Load extent udf_expand_dir_adinicb() has created */
@@ -537,11 +462,8 @@ add:
 						dir->i_sb->s_blocksize_bits);
 		fibh->ebh = udf_bread(dir,
 				f_pos >> dir->i_sb->s_blocksize_bits, 1, err);
-		if (!fibh->ebh) {
-			brelse(epos.bh);
-			brelse(fibh->sbh);
-			return NULL;
-		}
+		if (!fibh->ebh)
+			goto out_err;
 
 		if (!fibh->soffset) {
 			if (udf_next_aext(dir, &epos, &eloc, &elen, 1) ==
@@ -572,20 +494,25 @@ add:
 	cfi->lengthFileIdent = namelen;
 	cfi->lengthOfImpUse = cpu_to_le16(0);
 	if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name)) {
-		brelse(epos.bh);
 		dir->i_size += nfidlen;
 		if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
 			dinfo->i_lenAlloc += nfidlen;
 		mark_inode_dirty(dir);
-		return fi;
+		goto out_ok;
 	} else {
-		brelse(epos.bh);
-		if (fibh->sbh != fibh->ebh)
-			brelse(fibh->ebh);
-		brelse(fibh->sbh);
 		*err = -EIO;
-		return NULL;
+		goto out_err;
 	}
+
+out_err:
+	fi = NULL;
+	if (fibh->sbh != fibh->ebh)
+		brelse(fibh->ebh);
+	brelse(fibh->sbh);
+out_ok:
+	brelse(epos.bh);
+	kfree(name);
+	return fi;
 }
 
 static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
@@ -940,7 +867,7 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry,
 	char *ea;
 	int err;
 	int block;
-	char name[UDF_NAME_LEN];
+	char *name = NULL;
 	int namelen;
 	struct buffer_head *bh;
 	struct udf_inode_info *iinfo;
@@ -950,6 +877,12 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry,
 	if (!inode)
 		goto out;
 
+	name = kmalloc(UDF_NAME_LEN, GFP_NOFS);
+	if (!name) {
+		err = -ENOMEM;
+		goto out_no_entry;
+	}
+
 	iinfo = UDF_I(inode);
 	inode->i_mode = S_IFLNK | S_IRWXUGO;
 	inode->i_data.a_ops = &udf_symlink_aops;
@@ -1089,6 +1022,7 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry,
 	err = 0;
 
 out:
+	kfree(name);
 	unlock_kernel();
 	return err;