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authorFlorian Weimer <fweimer@redhat.com>2019-07-18 17:27:24 +0200
committerFlorian Weimer <fweimer@redhat.com>2019-07-26 00:24:59 +0200
commit50ce3eae5ba304650459d4441d7d246a7cefc26f (patch)
treee3679754b8b812c4468fe77156a1b31d5ecf1b2f /iconv
parent7e681561a3aea7aa8f21fb031a7c778147dfdf5b (diff)
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gconv: Check reference count in __gconv_release_cache [BZ #24677]
This fixes a regression introduced in commit
7e740ab2e7be7d83b75513aa406e0b10875f7f9c ("libio: Fix gconv-related
memory leak [BZ #24583]").

__gconv_release_cache is only ever called with heap-allocated
arrays which contain at least one member.  The statically allocated
ASCII steps are filtered out by __wcsmbs_close_conv.
Diffstat (limited to 'iconv')
-rw-r--r--iconv/gconv_cache.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/iconv/gconv_cache.c b/iconv/gconv_cache.c
index 9a456bf825..4db7287cee 100644
--- a/iconv/gconv_cache.c
+++ b/iconv/gconv_cache.c
@@ -446,9 +446,12 @@ __gconv_lookup_cache (const char *toset, const char *fromset,
 void
 __gconv_release_cache (struct __gconv_step *steps, size_t nsteps)
 {
-  if (gconv_cache != NULL)
-    /* The only thing we have to deallocate is the record with the
-       steps.  */
+  /* The only thing we have to deallocate is the record with the
+     steps.  But do not do this if the reference counter is still
+     positive.  This can happen if the steps array was cloned by
+     __wcsmbs_clone_conv.  (The array elements have separate __counter
+     fields, but they are only out of sync temporarily.)  */
+  if (gconv_cache != NULL && steps->__counter == 0)
     free (steps);
 }