merge-file: enforce MAX_XDIFF_SIZE on incoming files
The previous commit enforces MAX_XDIFF_SIZE at the
interfaces to xdiff: xdi_diff (which calls xdl_diff) and
ll_xdl_merge (which calls xdl_merge).
But we have another direct call to xdl_merge in
merge-file.c. If it were written today, this probably would
just use the ll_merge machinery. But it predates that code,
and uses slightly different options to xdl_merge (e.g.,
ZEALOUS_ALNUM).
We could try to abstract out an xdi_merge to match the
existing xdi_diff, but even that is difficult. Rather than
simply report error, we try to treat large files as binary,
and that distinction would happen outside of xdi_merge.
The simplest fix is to just replicate the MAX_XDIFF_SIZE
check in merge-file.c.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/merge-file.c b/builtin/merge-file.c
index 232b768..04ae36a 100644
--- a/builtin/merge-file.c
+++ b/builtin/merge-file.c
@@ -75,7 +75,8 @@
names[i] = argv[i];
if (read_mmfile(mmfs + i, fname))
return -1;
- if (buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
+ if (mmfs[i].size > MAX_XDIFF_SIZE ||
+ buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
return error("Cannot merge binary files: %s",
argv[i]);
}
