musl - musl - an implementation of the standard library for Linux-based systems

fix (normal, narrow) printf erroneously processing %n after output errors

unlike with wide printf variants, encoding errors are not a vector by which this bug is reachable, and the out() helper function already ensured that no further output could be written after an output error, transient or otherwise. however, the %n specifier could still be processed after an error, yielding a side effect that wrongly implied output had succeeded. due to buffering effects, it's still possible for %n to show output as having "succeeded", but for it never to appear on the underlying file due to an error at flush time. this change, however, ensures that processing of %n does not conflict with any error which has already been seen.

Diffstat (limited to 'src/stdio')

1 files changed, 3 insertions, 0 deletions