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-rw-r--r--libbb/copyfd.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/libbb/copyfd.c b/libbb/copyfd.c
index c5f8b5b87..f42eb7623 100644
--- a/libbb/copyfd.c
+++ b/libbb/copyfd.c
@@ -22,6 +22,8 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
char *buffer;
int buffer_size;
+ if (size > 0 && size <= 4 * 1024)
+ goto use_small_buf;
/* We want page-aligned buffer, just in case kernel is clever
* and can do page-aligned io more efficiently */
buffer = mmap(NULL, CONFIG_FEATURE_COPYBUF_KB * 1024,
@@ -30,6 +32,7 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
/* ignored: */ -1, 0);
buffer_size = CONFIG_FEATURE_COPYBUF_KB * 1024;
if (buffer == MAP_FAILED) {
+ use_small_buf:
buffer = alloca(4 * 1024);
buffer_size = 4 * 1024;
}