Index: head/usr.bin/patch/patch.c =================================================================== --- head/usr.bin/patch/patch.c +++ head/usr.bin/patch/patch.c @@ -1026,6 +1026,9 @@ const char *plineptr; unsigned short plinelen; + /* Patch does not match if we don't have any more context to use */ + if (pline > pat_lines) + return false; for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) { ilineptr = ifetch(iline, offset >= 0); if (ilineptr == NULL)