Fix pg_restore to guard against unexpected EOF while reading an archive file.

Per report and partial patch from Chad Wagner.

Author: tglsfdc

src/bin/pg_dump/pg_backup_archiver.c

@@ -15,7 +15,7 @@
  *
  *
  * IDENTIFICATION
- *		$Header: /cvsroot/pgsql/src/bin/pg_dump/pg_backup_archiver.c,v 1.62.2.7 2005/05/17 17:31:15 tgl Exp $
+ *		$Header: /cvsroot/pgsql/src/bin/pg_dump/pg_backup_archiver.c,v 1.62.2.8 2007/08/06 01:38:57 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1545,15 +1545,17 @@ ReadStr(ArchiveHandle *AH)
 	int			l;
 
 	l = ReadInt(AH);
-	if (l == -1)
+	if (l < 0)
 		buf = NULL;
 	else
 	{
 		buf = (char *) malloc(l + 1);
 		if (!buf)
 			die_horribly(AH, modulename, "out of memory\n");
 
-		(*AH->ReadBufPtr) (AH, (void *) buf, l);
+		if ((*AH->ReadBufPtr) (AH, (void *) buf, l) != l)
+			die_horribly(AH, modulename, "unexpected end of file\n");
+
 		buf[l] = '\0';
 	}
 
@@ -2277,8 +2279,8 @@ ReadHead(ArchiveHandle *AH)
 	/* If we haven't already read the header... */
 	if (!AH->readHeader)
 	{
-
-		(*AH->ReadBufPtr) (AH, tmpMag, 5);
+		if ((*AH->ReadBufPtr) (AH, tmpMag, 5) != 5)
+			die_horribly(AH, modulename, "unexpected end of file\n");
 
 		if (strncmp(tmpMag, "PGDMP", 5) != 0)
 			die_horribly(AH, modulename, "did not find magic string in file header\n");

src/bin/pg_dump/pg_backup_custom.c

@@ -19,7 +19,7 @@
  *
  *
  * IDENTIFICATION
- *		$Header: /cvsroot/pgsql/src/bin/pg_dump/pg_backup_custom.c,v 1.23 2002/10/25 01:33:17 momjian Exp $
+ *		$Header: /cvsroot/pgsql/src/bin/pg_dump/pg_backup_custom.c,v 1.23.2.1 2007/08/06 01:38:57 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -713,17 +713,18 @@ _WriteByte(ArchiveHandle *AH, const int i)
  *
  * Called by the archiver to read bytes & integers from the archive.
  * These routines are only used to read & write headers & TOC.
- *
+ * EOF should be treated as a fatal error.
  */
 static int
 _ReadByte(ArchiveHandle *AH)
 {
 	lclContext *ctx = (lclContext *) AH->formatData;
 	int			res;
 
-	res = fgetc(AH->FH);
-	if (res != EOF)
-		ctx->filePos += 1;
+	res = getc(AH->FH);
+	if (res == EOF)
+		die_horribly(AH, modulename, "unexpected end of file\n");
+	ctx->filePos += 1;
 	return res;
 }
 

src/bin/pg_dump/pg_backup_files.c

@@ -20,7 +20,7 @@
  *
  *
  * IDENTIFICATION
- *		$Header: /cvsroot/pgsql/src/bin/pg_dump/pg_backup_files.c,v 1.21 2002/10/25 01:33:17 momjian Exp $
+ *		$Header: /cvsroot/pgsql/src/bin/pg_dump/pg_backup_files.c,v 1.21.2.1 2007/08/06 01:38:57 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -396,9 +396,10 @@ _ReadByte(ArchiveHandle *AH)
 	lclContext *ctx = (lclContext *) AH->formatData;
 	int			res;
 
-	res = fgetc(AH->FH);
-	if (res != EOF)
-		ctx->filePos += 1;
+	res = getc(AH->FH);
+	if (res == EOF)
+		die_horribly(AH, modulename, "unexpected end of file\n");
+	ctx->filePos += 1;
 	return res;
 }
 

src/bin/pg_dump/pg_backup_tar.c

@@ -16,7 +16,7 @@
  *
  *
  * IDENTIFICATION
- *		$Header: /cvsroot/pgsql/src/bin/pg_dump/pg_backup_tar.c,v 1.32.2.2 2003/02/01 19:29:26 tgl Exp $
+ *		$Header: /cvsroot/pgsql/src/bin/pg_dump/pg_backup_tar.c,v 1.32.2.3 2007/08/06 01:38:57 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -484,7 +484,7 @@ _tarReadRaw(ArchiveHandle *AH, void *buf, size_t len, TAR_MEMBER *th, FILE *fh)
 			used = avail;
 
 		/* Copy, and adjust buffer pos */
-		memcpy(buf, AH->lookahead, used);
+		memcpy(buf, AH->lookahead + AH->lookaheadPos, used);
 		AH->lookaheadPos += used;
 
 		/* Adjust required length */
@@ -728,12 +728,13 @@ static int
 _ReadByte(ArchiveHandle *AH)
 {
 	lclContext *ctx = (lclContext *) AH->formatData;
-	int			res;
-	char		c = '\0';
+	size_t		res;
+	unsigned char c;
 
 	res = tarRead(&c, 1, ctx->FH);
-	if (res != EOF)
-		ctx->filePos += res;
+	if (res != 1)
+		die_horribly(AH, modulename, "unexpected end of file\n");
+	ctx->filePos += 1;
 	return c;
 }