fuzzing: Read complete source buffer on write

By reading the whole buffer an instrumented build can detect potential buffer
overflows on writing to a network connection.

Signed-off-by: Michael Hanselmann <public@hansmi.ch>

1 files changed, 5 insertions, 0 deletions

diff --git a/fuzzing/usbredirparserfuzz.cc b/fuzzing/usbredirparserfuzz.cc
index 7bd0e02..d163f8d 100644
--- a/fuzzing/usbredirparserfuzz.cc
+++ b/fuzzing/usbredirparserfuzz.cc
@@ -77,6 +77,11 @@ int parser_write(void *priv, uint8_t *data, int count)
 {
     log("%s: %d bytes\n", __func__, count);
 
+    // Read over complete source buffer to detect buffer overflows on write
+    void *buf = malloc(count);
+    memcpy(buf, data, count);
+    free(buf);
+
     return count;
 }