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Fix several problems in Flatten() that could potentially lead to overflows 

and/or crashes if given a smaller buffer size than the Flatten operation 
actually required.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42282 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Rene Gollent 2011-06-22 12:52:28 +00:00
parent 3270af3ca7
commit 46b619c39d
1 changed files with 6 additions and 7 deletions
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13
src/kits/app/Message.cpp
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@ -1011,21 +1011,20 @@ BMessage::Flatten(char *buffer, ssize_t size) const
if (fHeader == NULL)
return B_NO_INIT;
if (size < FlattenedSize())
return B_BUFFER_OVERFLOW;
/* we have to sync the what code as it is a public member */
fHeader->what = what;
memcpy(buffer, fHeader, min_c(sizeof(message_header), (size_t)size));
memcpy(buffer, fHeader, sizeof(message_header));
buffer += sizeof(message_header);
size -= sizeof(message_header);
size_t fieldsSize = fHeader->field_count * sizeof(field_header);
memcpy(buffer, fFields, min_c(fieldsSize, (size_t)size));
memcpy(buffer, fFields, fieldsSize);
buffer += fieldsSize;
size -= fieldsSize;
memcpy(buffer, fData, min_c(fHeader->data_size, (size_t)size));
if ((size_t)size < fHeader->data_size)
return B_BUFFER_OVERFLOW;
memcpy(buffer, fData, fHeader->data_size);
return B_OK;
}