File 0003-reduce-recursion-level-from-20-to-10-and-make-a-symb.patch of Package file.openSUSE_13.1_Update

From 6f737ddfadb596d7d4a993f7ed2141ffd664a81c Mon Sep 17 00:00:00 2001
From: Christos Zoulas <christos@zoulas.com>
Date: Sun, 23 Nov 2014 13:54:27 +0000
Subject: [PATCH] - reduce recursion level from 20 to 10 and make a symbolic
 constant for it. - pull out the guts of saving and
 restoring the output buffer into functions   and take care
 not to overwrite the error message if an error happened.

---
 src/file.h      |    8 ++++++++
 src/funcs.c     |   40 ++++++++++++++++++++++++++++++++++++++++
 src/softmagic.c |   37 ++++++++++++++++++++++---------------
 3 files changed, 70 insertions(+), 15 deletions(-)

--- src/file.h
+++ src/file.h	2014-12-17 00:00:00.000000000 +0000
@@ -468,6 +468,14 @@ protected int file_os2_apptype(struct ma
 #endif /* __EMX__ */
 
 
+typedef struct {
+	char *buf;
+	uint32_t offset;
+} file_pushbuf_t;
+
+protected file_pushbuf_t *file_push_buffer(struct magic_set *);
+protected char  *file_pop_buffer(struct magic_set *, file_pushbuf_t *);
+
 #ifndef COMPILE_ONLY
 extern const char *file_names[];
 extern const size_t file_nnames;
--- src/funcs.c
+++ src/funcs.c	2014-12-17 00:00:00.000000000 +0000
@@ -462,3 +462,43 @@ file_replace(struct magic_set *ms, const
 		return nm;
 	}
 }
+
+protected file_pushbuf_t *
+file_push_buffer(struct magic_set *ms)
+{
+	file_pushbuf_t *pb;
+
+	if (ms->event_flags & EVENT_HAD_ERR)
+		return NULL;
+
+	if ((pb = (CAST(file_pushbuf_t *, malloc(sizeof(*pb))))) == NULL)
+		return NULL;
+
+	pb->buf = ms->o.buf;
+	pb->offset = ms->offset;
+
+	ms->o.buf = NULL;
+	ms->offset = 0;
+
+	return pb;
+}
+
+protected char *
+file_pop_buffer(struct magic_set *ms, file_pushbuf_t *pb)
+{
+	char *rbuf;
+
+	if (ms->event_flags & EVENT_HAD_ERR) {
+		free(pb->buf);
+		free(pb);
+		return NULL;
+	}
+
+	rbuf = ms->o.buf;
+
+	ms->o.buf = pb->buf;
+	ms->offset = pb->offset;
+
+	free(pb);
+	return rbuf;
+}
--- src/softmagic.c
+++ src/softmagic.c	2014-12-17 00:00:00.000000000 +0000
@@ -63,6 +63,9 @@ private void cvt_32(union VALUETYPE *, c
 private void cvt_64(union VALUETYPE *, const struct magic *);
 
 #define OFFSET_OOB(n, o, i)	((n) < (o) || (i) > ((n) - (o)))
+
+#define MAX_RECURSION_LEVEL	10
+
 /*
  * softmagic - lookup one file in parsed, in-memory copy of database
  * Passed the name and FILE * of one file to be typed.
@@ -1124,14 +1127,15 @@ mget(struct magic_set *ms, const unsigne
     int flip, int recursion_level, int *printed_something,
     int *need_separator, int *returnval)
 {
-	uint32_t soffset, offset = ms->offset;
+	uint32_t offset = ms->offset;
 	uint32_t count = m->str_range;
 	int rv, oneed_separator, in_type;
-	char *sbuf, *rbuf;
+	file_pushbuf_t *pb;
+	char *rbuf;
 	union VALUETYPE *p = &ms->ms_value;
 	struct mlist ml;
 
-	if (recursion_level >= 20) {
+	if (recursion_level >= MAX_RECURSION_LEVEL) {
 		file_error(ms, 0, "recursion nesting exceeded");
 		return -1;
 	}
@@ -1709,17 +1713,20 @@ mget(struct magic_set *ms, const unsigne
 			return 0;
 		if (OFFSET_OOB(nbytes, offset, 0))
 			return 0;
-		sbuf = ms->o.buf;
-		soffset = ms->offset;
-		ms->o.buf = NULL;
-		ms->offset = 0;
+
+		if ((pb = file_push_buffer(ms)) == NULL)
+			return -1;
+
 		rv = file_softmagic(ms, s + offset, nbytes - offset,
 		    recursion_level, BINTEST, text);
+
 		if ((ms->flags & MAGIC_DEBUG) != 0)
 			fprintf(stderr, "indirect @offs=%u[%d]\n", offset, rv);
-		rbuf = ms->o.buf;
-		ms->o.buf = sbuf;
-		ms->offset = soffset;
+
+		rbuf = file_pop_buffer(ms, pb);
+		if (rbuf == NULL)
+			return -1;
+
 		if (rv == 1) {
 			if ((ms->flags & (MAGIC_MIME|MAGIC_APPLE)) == 0 &&
 			    file_printf(ms, m->desc, offset) == -1)
@@ -1733,13 +1740,13 @@ mget(struct magic_set *ms, const unsigne
 	case FILE_USE:
 		if (OFFSET_OOB(nbytes, offset, 0))
 			return 0;
-		sbuf = m->value.s;
-		if (*sbuf == '^') {
-			sbuf++;
+		rbuf = m->value.s;
+		if (*rbuf == '^') {
+			rbuf++;
 			flip = !flip;
 		}
-		if (file_magicfind(ms, sbuf, &ml) == -1) {
-			file_error(ms, 0, "cannot find entry `%s'", sbuf);
+		if (file_magicfind(ms, rbuf, &ml) == -1) {
+			file_error(ms, 0, "cannot find entry `%s'", rbuf);
 			return -1;
 		}