Add the fix for https://github.com/relan/exfat/issues/5 found and reported by The...

diff --git a/debian/changelog b/debian/changelog
index 5949e25db672785bf49ea01fb7d3c8cdf7d4c801..b3b2ddef38c4dc2906e9270742dff40f669cacfc 100644 (file)
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,10 @@
+fuse-exfat (1.1.0-2+deb8u1) UNRELEASED; urgency=medium
+
+  * Add the fix for https://github.com/relan/exfat/issues/5 found
+    and reported by The Fuzzing Project. Check sector and cluster size.
+
+ --
+
 fuse-exfat (1.1.0-2) unstable; urgency=low
 
   * Remove debian/watch - recent changes at Google code required

diff --git a/libexfat/mount.c b/libexfat/mount.c
index 2ebf43625315701e99eba3a543250420a44ce60c..2456187975ace01378270ad6722d08c351743923 100644 (file)
--- a/libexfat/mount.c
+++ b/libexfat/mount.c
@@ -208,6 +208,23 @@ int exfat_mount(struct exfat* ef, const char* spec, const char* options)
                exfat_error("exFAT file system is not found");
                return -EIO;
        }
+       /* sector cannot be smaller than 512 bytes */
+       if (ef->sb->sector_bits < 9)
+       {
+               exfat_close(ef->dev);
+               exfat_error("too small sector size: 2^%hhd", ef->sb->sector_bits);
+               free(ef->sb);
+               return -EIO;
+       }
+       /* officially exFAT supports cluster size up to 32 MB */
+       if ((int) ef->sb->sector_bits + (int) ef->sb->spc_bits > 25)
+       {
+               exfat_close(ef->dev);
+               exfat_error("too big cluster size: 2^(%hhd+%hhd)",
+                               ef->sb->sector_bits, ef->sb->spc_bits);
+               free(ef->sb);
+               return -EIO;
+       }
        ef->zero_cluster = malloc(CLUSTER_SIZE(*ef->sb));
        if (ef->zero_cluster == NULL)
        {
@@ -242,16 +259,6 @@ int exfat_mount(struct exfat* ef, const char* spec, const char* options)
                free(ef->sb);
                return -EIO;
        }
-       /* officially exFAT supports cluster size up to 32 MB */
-       if ((int) ef->sb->sector_bits + (int) ef->sb->spc_bits > 25)
-       {
-               free(ef->zero_cluster);
-               exfat_close(ef->dev);
-               exfat_error("too big cluster size: 2^%d",
-                               (int) ef->sb->sector_bits + (int) ef->sb->spc_bits);
-               free(ef->sb);
-               return -EIO;
-       }
        if (le64_to_cpu(ef->sb->sector_count) * SECTOR_SIZE(*ef->sb) >
                        exfat_get_size(ef->dev))
        {