lib: istream-seekable - Fix crash after write to temp file failed

Fixes:
Panic: file istream-seekable.c: line 230 (read_from_buffer): assertion failed: (*ret_r > 0)

diff --git a/src/lib/istream-seekable.c b/src/lib/istream-seekable.c
index d1879fe81d86a1264ec11e60781fe1aa73aa971a..5bc19ada8ebe130701547ced8ede8dc982642932 100644 (file)
--- a/src/lib/istream-seekable.c
+++ b/src/lib/istream-seekable.c
@@ -197,6 +197,10 @@ static bool read_from_buffer(struct seekable_istream *sstream, ssize_t *ret_r)
                stream->skip = stream->istream.v_offset;
                stream->pos = sstream->buffer_peak;
                size = stream->pos - stream->skip;
+               if (stream->istream.v_offset == sstream->buffer_peak) {
+                       /* this could happen after write to temp file failed */
+                       return read_from_buffer(sstream, ret_r);
+               }
        } else {
                /* need to read more */
                i_assert(stream->pos == sstream->buffer_peak);