Made the program stronger by handling more errors.

git-svn-id: svn://svn.gna.org/svn/chrysalide/trunk@167 abbe820e-26c8-41b2-8c08-b7b2b41f8b0a

2 files changed, 8 insertions, 0 deletions

diff --git a/src/common/endianness.c b/src/common/endianness.c
index 5c9b183..3a2a653 100755
--- a/src/common/endianness.c
+++ b/src/common/endianness.c
@@ -44,6 +44,7 @@
 
 bool read_u4(uint8_t *target, const bin_t *data, off_t *pos, off_t len, bool *low, SourceEndian endian)
 {
+    if (*pos < 0) return false;
     if ((len - *pos) < 1) return false;
 
     if (*low)
@@ -81,6 +82,7 @@ bool read_u4(uint8_t *target, const bin_t *data, off_t *pos, off_t len, bool *lo
 
 bool read_u8(uint8_t *target, const bin_t *data, off_t *pos, off_t len, SourceEndian endian)
 {
+    if (*pos < 0) return false;
     if ((len - *pos) < 1) return false;
 
     *target = data[*pos];
@@ -110,6 +112,7 @@ bool read_u8(uint8_t *target, const bin_t *data, off_t *pos, off_t len, SourceEn
 
 bool read_u16(uint16_t *target, const bin_t *data, off_t *pos, off_t len, SourceEndian endian)
 {
+    if (*pos < 0) return false;
     if ((len - *pos) < 2) return false;
 
     switch (endian)
@@ -181,6 +184,7 @@ bool read_u16(uint16_t *target, const bin_t *data, off_t *pos, off_t len, Source
 
 bool read_u32(uint32_t *target, const bin_t *data, off_t *pos, off_t len, SourceEndian endian)
 {
+    if (*pos < 0) return false;
     if ((len - *pos) < 4) return false;
 
     switch (endian)
diff --git a/src/common/leb128.c b/src/common/leb128.c
index 4a03797..1b65fa7 100644
--- a/src/common/leb128.c
+++ b/src/common/leb128.c
@@ -45,6 +45,8 @@ bool read_uleb128(uleb128_t *target, const bin_t *data, off_t *pos, off_t len)
     int shift;                              /* Décallage à appliquer       */
     off_t i;                                /* Boucle de parcours          */
 
+    if (*pos < 0) return false;
+
     shift = 0;
     *target = 0;
 
@@ -87,6 +89,8 @@ bool read_leb128(leb128_t *target, const bin_t *data, off_t *pos, off_t len)
     int shift;                              /* Décallage à appliquer       */
     off_t i;                                /* Boucle de parcours          */
 
+    if (*pos < 0) return false;
+
     shift = 0;
     *target = 0;