Fix some more bugs spotted by the docker fuzzer

dist/docker/fuzz/Dockerfile

@@ -9,4 +9,8 @@ ENV ASAN_OPTIONS="detect_odr_violation=0 detect_leaks=0"
 
 ENV R2_DEBUG_ASSERT=1
 
+# RUN git clone https://gitlab.com/akihe/radamsa && cd radamsa && make && make install
+# COPY script.r2 /script.r2
+# ENTRYPOINT while : ; do echo one ; cat /script.r2 | radamsa | rarun2 timeout=5 system="r2 -e scr.null=true -Nq malloc://1024" > /dev/null ; done
+
 ENTRYPOINT while : ; do cat /dev/urandom | strings | rarun2 timeout=5 system="r2 -e scr.null=true -Nq malloc://1024" > /dev/null ; done

libr/cons/cons.c

@@ -47,11 +47,11 @@ static void break_stack_free(void *ptr) {
 
 static void cons_stack_free(void *ptr) {
 	RConsStack *s = (RConsStack *)ptr;
-	free (s->buf);
+	R_FREE (s->buf);
 	if (s->grep) {
 		R_FREE (s->grep->str);
 	}
-	free (s->grep);
+	R_FREE (s->grep);
 	free (s);
 }
 
@@ -101,11 +101,13 @@ static void cons_stack_load(RConsStack *data, bool free_current) {
 }
 
 static void cons_grep_reset(RConsGrep *grep) {
-	R_FREE (grep->str);
-	ZERO_FILL (*grep);
-	grep->line = -1;
-	grep->sort = -1;
-	grep->sort_invert = false;
+	if (grep) {
+		R_FREE (grep->str);
+		ZERO_FILL (*grep);
+		grep->line = -1;
+		grep->sort = -1;
+		grep->sort_invert = false;
+	}
 }
 
 static void cons_context_init(RConsContext *context, R_NULLABLE RConsContext *parent) {

libr/core/cmd_anal.c

@@ -6734,6 +6734,9 @@ static void __core_anal_appcall(RCore *core, const char *input) {
 static void cmd_debug_stack_init(RCore *core, int argc, char **argv, char **envp) {
 	// TODO: add support for 32 bit
 	RBuffer *b = r_buf_new ();
+	if (!b) {
+		return;
+	}
 	ut64 sp = core->offset;
 	int i;
 	ut64 dyld_call_from = UT64_MAX;
@@ -6765,7 +6768,7 @@ static void cmd_debug_stack_init(RCore *core, int argc, char **argv, char **envp
 		r_buf_append_string (b, envp[i]);
 		r_buf_append_ut8 (b, 0);
 	}
-	int slen;
+	int slen = 0;
 	ut8 *s = r_buf_read_all (b, &slen);
 	char *x = r_hex_bin2strdup (s, slen);
 	r_cons_printf ("wx %s\n", x);

libr/core/cmd_cmp.c

@@ -1502,7 +1502,10 @@ static int cmd_cmp(void *data, const char *input) {
 		if (sz > 0) {
 			ut64 at = r_num_math (core->num, input + 2);
 			ut8 buf[8] = {0};
-			r_io_read_at (core->io, at, buf, sizeof (buf));
+			if (r_io_read_at (core->io, at, buf, sizeof (buf)) < 1) {
+				r_core_return_value (core, -1);
+				break;
+			}
 			int val = memcmp (buf, core->block, sz)? 1: 0;
 			r_core_return_value (core, val);
 		}

libr/core/cmd_mount.c

@@ -177,14 +177,14 @@ static int cmd_mount(void *data, const char *_input) {
 				fstype = input;
 			}
 
-			if (!r_fs_mount (core->fs, fstype, mountp, off)) {
+			if (fstype && !r_fs_mount (core->fs, fstype, mountp, off)) {
 				eprintf ("Cannot mount %s\n", input);
 			}
 		} else {
 			if (!(ptr = r_fs_name (core->fs, core->offset))) {
 				eprintf ("Unknown filesystem type\n");
 			}
-			if (!r_fs_mount (core->fs, ptr, input, core->offset)) {
+			if (ptr && !r_fs_mount (core->fs, ptr, input, core->offset)) {
 				eprintf ("Cannot mount %s\n", input);
 			}
 			free (ptr);