Add checks for memory allocation failures

Signed-off-by: Mahavir Jain <[email protected]>

examples/simplereader.c

@@ -15,6 +15,8 @@ static uint8_t *readfile(const char *fname, size_t *size)
     if (fstat(fileno(f), &st) == -1)
         return NULL;
     uint8_t *buf = malloc(st.st_size);
+    if (buf == NULL)
+        return NULL;
     *size = fread(buf, st.st_size, 1, f) == 1 ? st.st_size : 0;
     fclose(f);
     return buf;

src/cbortojson.c

@@ -179,6 +179,10 @@ static CborError dump_bytestring_base16(char **result, CborValue *it)
 
     /* a Base16 (hex) output is twice as big as our buffer */
     buffer = (uint8_t *)malloc(n * 2 + 1);
+    if (buffer == NULL)
+        /* out of memory */
+        return CborErrorOutOfMemory;
+
     *result = (char *)buffer;
 
     /* let cbor_value_copy_byte_string know we have an extra byte for the terminating NUL */
@@ -204,7 +208,12 @@ static CborError generic_dump_base64(char **result, CborValue *it, const char al
 
     /* a Base64 output (untruncated) has 4 bytes for every 3 in the input */
     size_t len = (n + 5) / 3 * 4;
-    out = buffer = (uint8_t *)malloc(len + 1);
+    buffer = (uint8_t *)malloc(len + 1);
+    if (buffer == NULL)
+        /* out of memory */
+        return CborErrorOutOfMemory;
+
+    out = buffer;
     *result = (char *)buffer;
 
     /* we read our byte string at the tail end of the buffer