logger: Fix incorrect buffer access when writing data

Fix crash caused by accessing memory beyond log->buffer

Change-Id: I528b62e34e9fb5f92f62f6b218718e15cd5f7d31
Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>

diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
index c860dae..df9f246 100644 (file)
--- a/drivers/staging/android/logger.c
+++ b/drivers/staging/android/logger.c
@@ -531,7 +531,7 @@ static void write_log_data(struct logger_log *log,
 
        /* message */
        len = min(chunk_len, log->size - w_off);
-       memcpy(log->buffer + w_off, writer->buffer, chunk_len);
+       memcpy(log->buffer + w_off, writer->buffer, len);
        memcpy(log->buffer, writer->buffer + len, chunk_len - len);
        log->w_off = logger_offset(log, w_off + chunk_len);
 }