cfg80211: make certificate generation more robust

If all net/wireless/certs/*.hex files are deleted, the build
will hang at this point since the 'cat' command will have no
arguments. Do "echo | cat - ..." so that even if the "..."
part is empty, the whole thing won't hang.

Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210618133832.c989056c3664.Ic3b77531d00b30b26dcd69c64e55ae2f60c3f31e@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/Makefile b/net/wireless/Makefile
index 2eee939..af590ae 100644 (file)
--- a/net/wireless/Makefile
+++ b/net/wireless/Makefile
@@ -28,7 +28,7 @@ $(obj)/shipped-certs.c: $(wildcard $(srctree)/$(src)/certs/*.hex)
        @$(kecho) "  GEN     $@"
        @(echo '#include "reg.h"'; \
          echo 'const u8 shipped_regdb_certs[] = {'; \
-         cat $^ ; \
+         echo | cat - $^ ; \
          echo '};'; \
          echo 'unsigned int shipped_regdb_certs_len = sizeof(shipped_regdb_certs);'; \
         ) > $@