sh-setup: protect from exported IFS

diff --git a/diff-delta.c b/diff-delta.c
index 464ac3ffc0a45e95637e2cecdf97b3d39e5c7933..93385e12baa0d90ae475bd02500edf5ddcce320c 100644 (file)
--- a/diff-delta.c
+++ b/diff-delta.c
@@ -146,7 +146,14 @@ struct delta_index * create_delta_index(const void *buf, unsigned long bufsize)
        /* Determine index hash size.  Note that indexing skips the
           first byte to allow for optimizing the Rabin's polynomial
           initialization in create_delta(). */
-       entries = (bufsize - 1)  / RABIN_WINDOW;
+       entries = (bufsize - 1) / RABIN_WINDOW;
+       if (bufsize >= 0xffffffffUL) {
+               /*
+                * Current delta format can't encode offsets into
+                * reference buffer with more than 32 bits.
+                */
+               entries = 0xfffffffeU / RABIN_WINDOW;
+       }
        hsize = entries / 4;
        for (i = 4; (1u << i) < hsize && i < 31; i++);
        hsize = 1 << i;