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-rw-r--r--libcli/smb/smb_util.h2
-rw-r--r--libcli/smb/util.c12
2 files changed, 14 insertions, 0 deletions
diff --git a/libcli/smb/smb_util.h b/libcli/smb/smb_util.h
index b5a06524cb..322ecb6397 100644
--- a/libcli/smb/smb_util.h
+++ b/libcli/smb/smb_util.h
@@ -23,3 +23,5 @@ char *attrib_string(TALLOC_CTX *mem_ctx, uint32_t attrib);
uint32_t unix_perms_to_wire(mode_t perms);
mode_t wire_perms_to_unix(uint32_t perms);
mode_t unix_filetype_from_wire(uint32_t wire_type);
+
+bool smb_buffer_oob(uint32_t bufsize, uint32_t offset, uint32_t length);
diff --git a/libcli/smb/util.c b/libcli/smb/util.c
index b8c3dc5e96..b02ae00d0d 100644
--- a/libcli/smb/util.c
+++ b/libcli/smb/util.c
@@ -163,3 +163,15 @@ mode_t unix_filetype_from_wire(uint32_t wire_type)
}
}
+bool smb_buffer_oob(uint32_t bufsize, uint32_t offset, uint32_t length)
+{
+ if ((offset + length < offset) || (offset + length < length)) {
+ /* wrap */
+ return true;
+ }
+ if ((offset > bufsize) || (offset + length > bufsize)) {
+ /* overflow */
+ return true;
+ }
+ return false;
+}