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-rw-r--r--src/bplist.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/src/bplist.c b/src/bplist.c
index d83f700..cdfea80 100644
--- a/src/bplist.c
+++ b/src/bplist.c
@@ -679,7 +679,9 @@ PLIST_API void plist_from_bin(const char *plist_bin, uint32_t length, plist_t *
uint8_t ref_size = 0;
uint64_t num_objects = 0;
uint64_t root_object = 0;
- char *offset_table = NULL;
+ const char *offset_table = NULL;
+ const char *start_data = NULL;
+ const char *end_data = NULL;
//first check we have enough data
if (!(length >= BPLIST_MAGIC_SIZE + BPLIST_VERSION_SIZE + sizeof(bplist_trailer_t)))
@@ -691,8 +693,11 @@ PLIST_API void plist_from_bin(const char *plist_bin, uint32_t length, plist_t *
if (memcmp(plist_bin + BPLIST_MAGIC_SIZE, BPLIST_VERSION, BPLIST_VERSION_SIZE) != 0)
return;
+ start_data = plist_bin + BPLIST_MAGIC_SIZE + BPLIST_VERSION_SIZE;
+ end_data = plist_bin + length - sizeof(bplist_trailer_t);
+
//now parse trailer
- trailer = (bplist_trailer_t*)(plist_bin + (length - sizeof(bplist_trailer_t)));
+ trailer = (bplist_trailer_t*)end_data;
offset_size = trailer->offset_size;
ref_size = trailer->ref_size;
@@ -712,10 +717,10 @@ PLIST_API void plist_from_bin(const char *plist_bin, uint32_t length, plist_t *
if (root_object >= num_objects)
return;
- if (offset_table < plist_bin || offset_table >= plist_bin + length)
+ if (offset_table < start_data || offset_table >= end_data)
return;
- if (offset_table + num_objects * offset_size >= plist_bin + length)
+ if (offset_table + num_objects * offset_size > end_data)
return;
struct bplist_data bplist;