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Fix crash in pb_release() if called twice on same message.

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There was a double-free bug in pb_release() because it didn't set size fields
to zero after deallocation. Most commonly this happens if pb_decode() fails,
internally calls pb_release() and then application code also calls pb_release().
This commit is contained in:
Petteri Aimonen
2014-09-06 18:21:58 +03:00
parent 2f05a35b5f
commit b7add1e577
1 changed files with 15 additions and 10 deletions
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9
pb_decode.c
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@@ -962,16 +962,20 @@ void pb_release(const pb_field_t fields[], void *dest_struct)
pb_free(*pItem);
*pItem++ = NULL;
}
*(pb_size_t*)iter.pSize = 0;
}
else if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE)
{
/* Release fields in submessages */
void *pItem = *(void**)iter.pData;
size_t count = (pItem ? 1 : 0);
if (pItem)
{
pb_size_t count = 1;
if (PB_HTYPE(type) == PB_HTYPE_REPEATED)
{
count = *(size_t*)iter.pSize;
count = *(pb_size_t*)iter.pSize;
*(pb_size_t*)iter.pSize = 0;
}
while (count--)
@@ -980,6 +984,7 @@ void pb_release(const pb_field_t fields[], void *dest_struct)
pItem = (uint8_t*)pItem + iter.pos->data_size;
}
}
}
/* Release main item */
pb_free(*(void**)iter.pData);