hexdump: catch memory leaks

Signed-off-by: Ondrej Oprala <ooprala@redhat.com>

text-utils/display.c

@@ -279,12 +279,12 @@ get(void)
 		 */
 		if (!length || (ateof && !next(NULL))) {
 			if (need == blocksize)
-				return(NULL);
+				goto retnul;
 			if (!need && vflag != ALL &&
 			    !memcmp(curp, savp, nread)) {
 				if (vflag != DUP)
 					printf("*\n");
-				return(NULL);
+				goto retnul;
 			}
 			if (need > 0)
 				memset((char *)curp + nread, 0, need);
@@ -293,7 +293,7 @@ get(void)
 		}
 		if (fileno(stdin) == -1) {
 			warnx(_("all input file arguments failed"));
-			return(NULL);
+			goto retnul;
 		}
 		n = fread((char *)curp + nread, sizeof(unsigned char),
 		    length == -1 ? need : min(length, need), stdin);
@@ -323,6 +323,10 @@ get(void)
 		else
 			nread += n;
 	}
+retnul:
+	free (curp);
+	free (savp);
+	return NULL;
 }
 
 int next(char **argv)

text-utils/hexdump.c

@@ -50,6 +50,7 @@ struct list_head fshead;				/* head of format strings */
 ssize_t blocksize;			/* data block size */
 int exitval;				/* final exit value */
 ssize_t length = -1;			/* max bytes to read */
+void hex_free(void);
 
 int main(int argc, char **argv)
 {
@@ -83,5 +84,28 @@ int main(int argc, char **argv)
 
 	next(argv);
 	display();
+	hex_free();
 	return exitval;
 }
+
+void hex_free(void)
+{
+	struct list_head *p, *pn, *q, *qn, *r, *rn;
+	FS *fs;
+	FU *fu;
+	PR *pr;
+	list_for_each_safe(p, pn, &fshead) {
+		fs = list_entry(p, FS, fslist);
+		list_for_each_safe(q, qn, &fs->fulist) {
+			fu = list_entry(q, FU, fulist);
+			list_for_each_safe(r, rn, &fu->prlist) {
+				pr = list_entry(r, PR, prlist);
+				free(pr->fmt);
+				free(pr);
+			}
+			free(fu->fmt);
+			free(fu);
+		}
+		free(fs);
+	}
+}

text-utils/parse.c

@@ -231,7 +231,7 @@ void rewrite(FS *fs)
 
 			/* Only text in the string. */
 			if (!*p1) {
-				pr->fmt = fmtp;
+				pr->fmt = xstrdup(fmtp);
 				pr->flags = F_TEXT;
 				break;
 			}