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-rw-r--r--src/lzma/args.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/lzma/args.c b/src/lzma/args.c
index 24fc0939..4393a6bd 100644
--- a/src/lzma/args.c
+++ b/src/lzma/args.c
@@ -462,6 +462,15 @@ set_compression_settings(void)
// Terminate the filter options array.
opt_filters[filter_count].id = LZMA_VLI_VALUE_UNKNOWN;
+ // If we are using the LZMA_Alone format, allow exactly one filter
+ // which has to be LZMA.
+ if (opt_header == HEADER_ALONE && (filter_count != 1
+ || opt_filters[0].id != LZMA_FILTER_LZMA)) {
+ errmsg(V_ERROR, _("With --format=alone only the LZMA filter "
+ "is supported"));
+ my_exit(ERROR);
+ }
+
// Optimize the filter chain a little by removing all
// Copy filters.
for (size_t i = 0; opt_filters[i].id != LZMA_VLI_VALUE_UNKNOWN; ++i) {