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authorPatsy Franklin <pfrankli@redhat.com>2017-08-29 15:53:28 +0200
committerFlorian Weimer <fweimer@redhat.com>2017-08-29 15:53:28 +0200
commit1cf1232cd4721dc155a5cf7d571e5b1dae506430 (patch)
treebb78b85294b07816b899e8ecac58b9bc5a41475a /iconv
parentf11f2f6e145d6fc6b52f6b0733599f8b96595733 (diff)
downloadglibc-1cf1232cd4721dc155a5cf7d571e5b1dae506430.tar.gz
gconv: Consistently mangle NULL function pointers [BZ #22025]
Not mangling NULL pointers is not safe because with very low probability, a non-NULL function pointer can turn into a NULL pointer after mangling.
Diffstat (limited to 'iconv')
-rw-r--r--iconv/gconv_cache.c11
-rw-r--r--iconv/gconv_db.c41
-rw-r--r--iconv/gconv_dl.c6
3 files changed, 23 insertions, 35 deletions
diff --git a/iconv/gconv_cache.c b/iconv/gconv_cache.c
index d6a47de838..7d2751a506 100644
--- a/iconv/gconv_cache.c
+++ b/iconv/gconv_cache.c
@@ -207,17 +207,16 @@ find_module (const char *directory, const char *filename,
result->__data = NULL;
/* Call the init function. */
- if (result->__init_fct != NULL)
- {
- __gconv_init_fct init_fct = result->__init_fct;
+ __gconv_init_fct init_fct = result->__init_fct;
#ifdef PTR_DEMANGLE
- PTR_DEMANGLE (init_fct);
+ PTR_DEMANGLE (init_fct);
#endif
+ if (init_fct != NULL)
+ {
status = DL_CALL_FCT (init_fct, (result));
#ifdef PTR_MANGLE
- if (result->__btowc_fct != NULL)
- PTR_MANGLE (result->__btowc_fct);
+ PTR_MANGLE (result->__btowc_fct);
#endif
}
}
diff --git a/iconv/gconv_db.c b/iconv/gconv_db.c
index 7893fadba1..b748467de5 100644
--- a/iconv/gconv_db.c
+++ b/iconv/gconv_db.c
@@ -179,16 +179,15 @@ free_derivation (void *p)
size_t cnt;
for (cnt = 0; cnt < deriv->nsteps; ++cnt)
- if (deriv->steps[cnt].__counter > 0
- && deriv->steps[cnt].__end_fct != NULL)
+ if ((deriv->steps[cnt].__counter > 0)
+ && (deriv->steps[cnt].__shlib_handle != NULL))
{
- assert (deriv->steps[cnt].__shlib_handle != NULL);
-
__gconv_end_fct end_fct = deriv->steps[cnt].__end_fct;
#ifdef PTR_DEMANGLE
PTR_DEMANGLE (end_fct);
#endif
- DL_CALL_FCT (end_fct, (&deriv->steps[cnt]));
+ if (end_fct != NULL)
+ DL_CALL_FCT (end_fct, (&deriv->steps[cnt]));
}
/* Free the name strings. */
@@ -212,16 +211,12 @@ __gconv_release_step (struct __gconv_step *step)
if (step->__shlib_handle != NULL && --step->__counter == 0)
{
/* Call the destructor. */
- if (step->__end_fct != NULL)
- {
- assert (step->__shlib_handle != NULL);
-
- __gconv_end_fct end_fct = step->__end_fct;
+ __gconv_end_fct end_fct = step->__end_fct;
#ifdef PTR_DEMANGLE
- PTR_DEMANGLE (end_fct);
+ PTR_DEMANGLE (end_fct);
#endif
- DL_CALL_FCT (end_fct, (step));
- }
+ if (end_fct != NULL)
+ DL_CALL_FCT (end_fct, (step));
#ifndef STATIC_GCONV
/* Release the loaded module. */
@@ -313,13 +308,11 @@ gen_steps (struct derivation_step *best, const char *toset,
/* Call the init function. */
__gconv_init_fct init_fct = result[step_cnt].__init_fct;
- if (init_fct != NULL)
- {
- assert (result[step_cnt].__shlib_handle != NULL);
-
# ifdef PTR_DEMANGLE
- PTR_DEMANGLE (init_fct);
+ PTR_DEMANGLE (init_fct);
# endif
+ if (init_fct != NULL)
+ {
status = DL_CALL_FCT (init_fct, (&result[step_cnt]));
if (__builtin_expect (status, __GCONV_OK) != __GCONV_OK)
@@ -332,8 +325,7 @@ gen_steps (struct derivation_step *best, const char *toset,
}
# ifdef PTR_MANGLE
- if (result[step_cnt].__btowc_fct != NULL)
- PTR_MANGLE (result[step_cnt].__btowc_fct);
+ PTR_MANGLE (result[step_cnt].__btowc_fct);
# endif
}
}
@@ -415,16 +407,15 @@ increment_counter (struct __gconv_step *steps, size_t nsteps)
/* Call the init function. */
__gconv_init_fct init_fct = step->__init_fct;
- if (init_fct != NULL)
- {
#ifdef PTR_DEMANGLE
- PTR_DEMANGLE (init_fct);
+ PTR_DEMANGLE (init_fct);
#endif
+ if (init_fct != NULL)
+ {
DL_CALL_FCT (init_fct, (step));
#ifdef PTR_MANGLE
- if (step->__btowc_fct != NULL)
- PTR_MANGLE (step->__btowc_fct);
+ PTR_MANGLE (step->__btowc_fct);
#endif
}
}
diff --git a/iconv/gconv_dl.c b/iconv/gconv_dl.c
index 241836204d..d7dbba90a2 100644
--- a/iconv/gconv_dl.c
+++ b/iconv/gconv_dl.c
@@ -131,10 +131,8 @@ __gconv_find_shlib (const char *name)
#ifdef PTR_MANGLE
PTR_MANGLE (found->fct);
- if (found->init_fct != NULL)
- PTR_MANGLE (found->init_fct);
- if (found->end_fct != NULL)
- PTR_MANGLE (found->end_fct);
+ PTR_MANGLE (found->init_fct);
+ PTR_MANGLE (found->end_fct);
#endif
/* We have succeeded in loading the shared object. */