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[uclibc-ng-devel,28/32] Fix htab_delete loop counter

Message ID 20180704155605.1892-29-christophe.lyon@st.com
State Accepted
Headers show
Series FDPIC ABI for ARM | expand

Commit Message

Christophe Lyon July 4, 2018, 3:55 p.m. UTC
dlclose can crash or stuck the system:

When calling dlclose() then system can crash or freeze, because
htab_delete() in ldso/ldso/fdpic/dl-inlines.h uses size_t for i which
is a typedef to unsigned int.  We exit the loop on negative value of i
which can never occur since i is an unsigned int. This leads to random
free of various pointers that kill the system.

	* ldso/include/inline-hashtab.h (htab_delete): Change type of 'i' to int.

Signed-off-by: Mickaël Guêné <mickael.guene@st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
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diff --git a/ldso/include/inline-hashtab.h b/ldso/include/inline-hashtab.h
index 4a48120..c6c584b 100644
--- a/ldso/include/inline-hashtab.h
+++ b/ldso/include/inline-hashtab.h
@@ -107,7 +107,7 @@  htab_create(void)
 static __always_inline void
 htab_delete(struct funcdesc_ht *htab)
-	size_t i;
+	int i;
 	for (i = htab->size - 1; i >= 0; i--)
 		if (htab->entries[i])