Crash while determining coding system

[Originally sent 19 Mar 2014, but I haven't seen it show up in the archives.] I just received a bug report for the Fedora build of XEmacs: https://bugzilla.redhat.com/show_bug.cgi?id=1078159 What seems to have happened is that determine_real_coding_system (file-coding.c) was called, and tried to read some data from the lstream. However, Lstream_read encountered an error of some kind, I don't know what. This resulted in an empty buffer, and nread == -1. We then proceeded to pass the empty buffer and the count of -1 to detect_coding_type, which used the count of -1 to justify walking off the end of allocated memory, thereby triggering a segfault. We need to notice the Lstream_read failure and bail out of determine_real_coding_system. I'm not entirely sure of the right way to do that. If one of you coding system master could suggest something, I'd appreciate it. -- Jerry James http://www.jamezone.org/ _______________________________________________ XEmacs-Beta mailing list XEmacs-Beta(a)xemacs.org http://lists.xemacs.org/mailman/listinfo/xemacs-beta