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-rw-r--r--archival/libarchive/decompress_unlzma.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/archival/libarchive/decompress_unlzma.c b/archival/libarchive/decompress_unlzma.c
index a904087..be43424 100644
--- a/archival/libarchive/decompress_unlzma.c
+++ b/archival/libarchive/decompress_unlzma.c
@@ -450,8 +450,12 @@ unpack_lzma_stream(transformer_state_t *xstate)
IF_NOT_FEATURE_LZMA_FAST(string:)
do {
uint32_t pos = buffer_pos - rep0;
- if ((int32_t)pos < 0)
+ if ((int32_t)pos < 0) {
pos += header.dict_size;
+ /* bug 10436 has an example file where this triggers: */
+ if ((int32_t)pos < 0)
+ goto bad;
+ }
previous_byte = buffer[pos];
IF_NOT_FEATURE_LZMA_FAST(one_byte2:)
buffer[buffer_pos++] = previous_byte;