1 files changed, 10 insertions, 2 deletions

diff --git a/archival/libarchive/decompress_gunzip.c b/archival/libarchive/decompress_gunzip.c
index eb3b64930..e93cd5005 100644
--- a/archival/libarchive/decompress_gunzip.c
+++ b/archival/libarchive/decompress_gunzip.c
@@ -220,10 +220,20 @@ static const uint8_t border[] ALIGN1 = {
  * each table.
  * t: table to free
  */
+#define BAD_HUFT(p) ((uintptr_t)(p) & 1)
+#define ERR_RET     ((huft_t*)(uintptr_t)1)
 static void huft_free(huft_t *p)
 {
         huft_t *q;
 
+        /*
+         * If 'p' has the error bit set we have to clear it, otherwise we might run
+         * into a segmentation fault or an invalid pointer to free(p)
+         */
+        if (BAD_HUFT(p)) {
+                p = (huft_t*)((uintptr_t)(p) ^ (uintptr_t)(ERR_RET));
+        }
+
         /* Go through linked list, freeing from the malloced (t[-1]) address. */
         while (p) {
                 q = (--p)->v.t;
@@ -289,8 +299,6 @@ static unsigned fill_bitbuffer(STATE_PARAM unsigned bitbuffer, unsigned *current
  * or a valid pointer to a Huffman table, ORed with 0x1 if incompete table
  * is given: "fixed inflate" decoder feeds us such data.
  */
-#define BAD_HUFT(p) ((uintptr_t)(p) & 1)
-#define ERR_RET     ((huft_t*)(uintptr_t)1)
 static huft_t* huft_build(const unsigned *b, const unsigned n,
                         const unsigned s, const struct cp_ext *cp_ext,
                         unsigned *m)