grep: fix subscript error when testing whether empty lines match

src/grep.c (grep): When testing whether an empty line matches,
make the input buffer one byte longer, as dfaexec uses that
for a sentinel.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/grep.c b/src/grep.c
index bb5ba1c4..7475ea16 100644
--- a/src/grep.c
+++ b/src/grep.c
@@ -2513,8 +2513,9 @@ main (int argc, char **argv)
 
   compile (keys, keycc);
   free (keys);
+  char eolbytes[2] = { eolbyte };
   size_t match_size;
-  skip_empty_lines = ((execute (&eolbyte, 1, &match_size, NULL) == 0)
+  skip_empty_lines = ((execute (eolbytes, 1, &match_size, NULL) == 0)
                       == out_invert);
 
   if ((argc - optind > 1 && !no_filenames) || with_filenames)