The documentation comment for qemu_semihosting_console_write() says
* Returns: number of bytes written -- this should only ever be short
* on some sort of i/o error.
and the callsites rely on this. However, the implementation code
path which sends console output to a chardev doesn't honour this,
and will return negative values on error. Bring it into line with
the other implementation codepaths and the documentation, so that
it returns 0 on error.
Spotted by Coverity, because console_write() passes the return value
to unlock_user(), which doesn't accept a negative length.
Resolves: Coverity CID 1490288
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220719121110.225657-2-peter.maydell@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20220725140520.515340-7-alex.bennee@linaro.org>
aed04e6357