udf: Get rid of 0-length arrays

Declare variable length arrays using [] instead of the old-style
declarations using arrays with 0 members. Also comment out entries in
structures beyond the first variable length array (we still do keep them
in comments as a reminder there are further entries in the structure
behind the variable length array). Accessing such entries needs a
careful offset math anyway so it is safer to not have them declared.

Signed-off-by: Jan Kara <jack@suse.cz>

2 files changed, 25 insertions, 26 deletions

diff --git a/fs/udf/ecma_167.h b/fs/udf/ecma_167.h
index 185c3e247648..c6bea5c9841a 100644
--- a/fs/udf/ecma_167.h
+++ b/fs/udf/ecma_167.h
@@ -307,14 +307,14 @@ struct logicalVolDesc {
 	struct regid		impIdent;
 	uint8_t			impUse[128];
 	struct extent_ad	integritySeqExt;
-	uint8_t			partitionMaps[0];
+	uint8_t			partitionMaps[];
 } __packed;
 
 /* Generic Partition Map (ECMA 167r3 3/10.7.1) */
 struct genericPartitionMap {
 	uint8_t		partitionMapType;
 	uint8_t		partitionMapLength;
-	uint8_t		partitionMapping[0];
+	uint8_t		partitionMapping[];
 } __packed;
 
 /* Partition Map Type (ECMA 167r3 3/10.7.1.1) */
@@ -342,7 +342,7 @@ struct unallocSpaceDesc {
 	struct tag		descTag;
 	__le32			volDescSeqNum;
 	__le32			numAllocDescs;
-	struct extent_ad	allocDescs[0];
+	struct extent_ad	allocDescs[];
 } __packed;
 
 /* Terminating Descriptor (ECMA 167r3 3/10.9) */
@@ -360,9 +360,9 @@ struct logicalVolIntegrityDesc {
 	uint8_t			logicalVolContentsUse[32];
 	__le32			numOfPartitions;
 	__le32			lengthOfImpUse;
-	__le32			freeSpaceTable[0];
-	__le32			sizeTable[0];
-	uint8_t			impUse[0];
+	__le32			freeSpaceTable[];
+	/* __le32		sizeTable[]; */
+	/* uint8_t		impUse[]; */
 } __packed;
 
 /* Integrity Type (ECMA 167r3 3/10.10.3) */
@@ -578,8 +578,8 @@ struct fileEntry {
 	__le64			uniqueID;
 	__le32			lengthExtendedAttr;
 	__le32			lengthAllocDescs;
-	uint8_t			extendedAttr[0];
-	uint8_t			allocDescs[0];
+	uint8_t			extendedAttr[];
+	/* uint8_t		allocDescs[]; */
 } __packed;
 
 /* Permissions (ECMA 167r3 4/14.9.5) */
@@ -632,7 +632,7 @@ struct genericFormat {
 	uint8_t		attrSubtype;
 	uint8_t		reserved[3];
 	__le32		attrLength;
-	uint8_t		attrData[0];
+	uint8_t		attrData[];
 } __packed;
 
 /* Character Set Information (ECMA 167r3 4/14.10.3) */
@@ -643,7 +643,7 @@ struct charSetInfo {
 	__le32		attrLength;
 	__le32		escapeSeqLength;
 	uint8_t		charSetType;
-	uint8_t		escapeSeq[0];
+	uint8_t		escapeSeq[];
 } __packed;
 
 /* Alternate Permissions (ECMA 167r3 4/14.10.4) */
@@ -682,7 +682,7 @@ struct infoTimesExtAttr {
 	__le32		attrLength;
 	__le32		dataLength;
 	__le32		infoTimeExistence;
-	uint8_t		infoTimes[0];
+	uint8_t		infoTimes[];
 } __packed;
 
 /* Device Specification (ECMA 167r3 4/14.10.7) */
@@ -694,7 +694,7 @@ struct deviceSpec {
 	__le32		impUseLength;
 	__le32		majorDeviceIdent;
 	__le32		minorDeviceIdent;
-	uint8_t		impUse[0];
+	uint8_t		impUse[];
 } __packed;
 
 /* Implementation Use Extended Attr (ECMA 167r3 4/14.10.8) */
@@ -705,7 +705,7 @@ struct impUseExtAttr {
 	__le32		attrLength;
 	__le32		impUseLength;
 	struct regid	impIdent;
-	uint8_t		impUse[0];
+	uint8_t		impUse[];
 } __packed;
 
 /* Application Use Extended Attribute (ECMA 167r3 4/14.10.9) */
@@ -716,7 +716,7 @@ struct appUseExtAttr {
 	__le32		attrLength;
 	__le32		appUseLength;
 	struct regid	appIdent;
-	uint8_t		appUse[0];
+	uint8_t		appUse[];
 } __packed;
 
 #define EXTATTR_CHAR_SET		1
@@ -733,7 +733,7 @@ struct unallocSpaceEntry {
 	struct tag	descTag;
 	struct icbtag	icbTag;
 	__le32		lengthAllocDescs;
-	uint8_t		allocDescs[0];
+	uint8_t		allocDescs[];
 } __packed;
 
 /* Space Bitmap Descriptor (ECMA 167r3 4/14.12) */
@@ -741,7 +741,7 @@ struct spaceBitmapDesc {
 	struct tag	descTag;
 	__le32		numOfBits;
 	__le32		numOfBytes;
-	uint8_t		bitmap[0];
+	uint8_t		bitmap[];
 } __packed;
 
 /* Partition Integrity Entry (ECMA 167r3 4/14.13) */
@@ -780,7 +780,7 @@ struct pathComponent {
 	uint8_t		componentType;
 	uint8_t		lengthComponentIdent;
 	__le16		componentFileVersionNum;
-	dchars		componentIdent[0];
+	dchars		componentIdent[];
 } __packed;
 
 /* File Entry (ECMA 167r3 4/14.17) */
@@ -809,8 +809,8 @@ struct extendedFileEntry {
 	__le64			uniqueID;
 	__le32			lengthExtendedAttr;
 	__le32			lengthAllocDescs;
-	uint8_t			extendedAttr[0];
-	uint8_t			allocDescs[0];
+	uint8_t			extendedAttr[];
+	/* uint8_t		allocDescs[]; */
 } __packed;
 
 #endif /* _ECMA_167_H */
diff --git a/fs/udf/osta_udf.h b/fs/udf/osta_udf.h
index 1c83aeede52e..157de0ec0cd5 100644
--- a/fs/udf/osta_udf.h
+++ b/fs/udf/osta_udf.h
@@ -111,7 +111,7 @@ struct logicalVolIntegrityDescImpUse {
 	__le16		minUDFReadRev;
 	__le16		minUDFWriteRev;
 	__le16		maxUDFWriteRev;
-	uint8_t		impUse[0];
+	uint8_t		impUse[];
 } __packed;
 
 /* Implementation Use Volume Descriptor (UDF 2.60 2.2.7) */
@@ -190,8 +190,8 @@ struct virtualAllocationTable20 {
 	__le16		minUDFWriteRev;
 	__le16		maxUDFWriteRev;
 	__le16		reserved;
-	uint8_t		impUse[0];
-	__le32		vatEntry[0];
+	uint8_t		impUse[];
+	/* __le32	vatEntry[]; */
 } __packed;
 
 #define ICBTAG_FILE_TYPE_VAT20		0xF8U
@@ -208,8 +208,7 @@ struct sparingTable {
 	__le16		reallocationTableLen;
 	__le16		reserved;
 	__le32		sequenceNum;
-	struct sparingEntry
-			mapEntry[0];
+	struct sparingEntry mapEntry[];
 } __packed;
 
 /* Metadata File (and Metadata Mirror File) (UDF 2.60 2.2.13.1) */
@@ -232,7 +231,7 @@ struct allocDescImpUse {
 /* FreeEASpace (UDF 2.60 3.3.4.5.1.1) */
 struct freeEaSpace {
 	__le16		headerChecksum;
-	uint8_t		freeEASpace[0];
+	uint8_t		freeEASpace[];
 } __packed;
 
 /* DVD Copyright Management Information (UDF 2.60 3.3.4.5.1.2) */
@@ -256,7 +255,7 @@ struct LVExtensionEA {
 /* FreeAppEASpace (UDF 2.60 3.3.4.6.1) */
 struct freeAppEASpace {
 	__le16		headerChecksum;
-	uint8_t		freeEASpace[0];
+	uint8_t		freeEASpace[];
 } __packed;
 
 /* UDF Defined System Stream (UDF 2.60 3.3.7) */