imap: Set max buffer size for CATENATE istream-chain

This fixes a crash with mbox when nonexistent CATENATE URL is attempted to
be used. The istream doesn't get any size, and istream-header-filter panics
due to having reached the maximum buffer size (0), even though the stream is
empty and there's nothing to read.

diff --git a/src/imap/cmd-append.c b/src/imap/cmd-append.c
index 823e675ef01a2529872ea01e2a33abbacc5e2eae..a630b9c8de06508653842ec4983d5de4a6cbea71 100644 (file)
--- a/src/imap/cmd-append.c
+++ b/src/imap/cmd-append.c
@@ -563,6 +563,7 @@ cmd_append_handle_args(struct client_command_context *cmd,
        if (cat_list != NULL) {
                ctx->cat_msg_size = 0;
                ctx->input = i_stream_create_chain(&ctx->catchain);
+               i_stream_set_max_buffer_size(ctx->input, IO_BLOCK_SIZE);
        } else {
                if (ctx->literal_size == 0) {
                        /* no message data, abort */