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-rw-r--r--src/liblzma/lzma/lzma_encoder.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/liblzma/lzma/lzma_encoder.c b/src/liblzma/lzma/lzma_encoder.c
index a84801e7..5302a707 100644
--- a/src/liblzma/lzma/lzma_encoder.c
+++ b/src/liblzma/lzma/lzma_encoder.c
@@ -165,8 +165,10 @@ match(lzma_coder *coder, const uint32_t pos_state,
const uint32_t pos_reduced = distance - base;
if (pos_slot < END_POS_MODEL_INDEX) {
+ // Careful here: base - pos_slot - 1 can be -1, but
+ // rc_bittree_reverse starts at probs[1], not probs[0].
rc_bittree_reverse(&coder->rc,
- &coder->pos_special[base - pos_slot - 1],
+ coder->pos_special + base - pos_slot - 1,
footer_bits, pos_reduced);
} else {
rc_direct(&coder->rc, pos_reduced >> ALIGN_BITS,