diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 60aa77f79785..4dd64069c434 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -1014,7 +1014,20 @@ static ssize_t dso_cache__memcpy(struct dso_cache *cache, u64 offset, u8 *data,
 				 u64 size, bool out)
 {
 	u64 cache_offset = offset - cache->offset;
-	u64 cache_size   = min(cache->size - cache_offset, size);
+	u64 cache_size;
+
+	/*
+	 * The RB tree matches using DSO__DATA_CACHE_SIZE, but a short
+	 * pread may leave cache->size smaller.  For a regular file a
+	 * short pread only happens at end-of-file, so an offset past
+	 * the valid data is EOF: return 0, matching what a direct
+	 * pread() at that offset would return, and cached_io() then
+	 * stops its read loop.
+	 */
+	if (cache_offset >= cache->size)
+		return 0;
+
+	cache_size = min(cache->size - cache_offset, size);
 
 	if (out)
 		memcpy(data, cache->data + cache_offset, cache_size);