libio: freopen of default streams crashes in old programs [BZ #24632]

[thirdparty/glibc.git] / libio / libioP.h

diff --git a/libio/libioP.h b/libio/libioP.h
index 66afaa89689b65b46f12cd96758e9d00142fe44b..afa46cc5194189052ef2cba4ac4531c4607be7bb 100644 (file)
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -108,9 +108,14 @@
   (IO_validate_vtable                                                   \
    (*(struct _IO_jump_t **) ((void *) &_IO_JUMPS_FILE_plus (THIS)      \
                             + (THIS)->_vtable_offset)))
+# define _IO_JUMPS_FUNC_UPDATE(THIS, VTABLE)                           \
+  (*(const struct _IO_jump_t **) ((void *) &_IO_JUMPS_FILE_plus (THIS) \
+                                 + (THIS)->_vtable_offset) = (VTABLE))
 # define _IO_vtable_offset(THIS) (THIS)->_vtable_offset
 #else
 # define _IO_JUMPS_FUNC(THIS) (IO_validate_vtable (_IO_JUMPS_FILE_plus (THIS)))
+# define _IO_JUMPS_FUNC_UPDATE(THIS, VTABLE) \
+  (_IO_JUMPS_FILE_plus (THIS) = (VTABLE))
 # define _IO_vtable_offset(THIS) 0
 #endif
 #define _IO_WIDE_JUMPS_FUNC(THIS) _IO_WIDE_JUMPS(THIS)