diff options
| author | Daniel P. Berrange <berrange@redhat.com> | 2016-09-06 14:56:02 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-09-13 19:09:42 +0200 |
| commit | b72981b910097b31f4d0b9c111a2d2cfd9ee585b (patch) | |
| tree | fd4b43d72ea6e6c55b2083e6ed4548ceb44f85aa /hw/ipmi | |
| parent | e270d00afa58c8a2903ec85db51407abc4e3269d (diff) | |
ipmi: check return of qemu_chr_fe_write() for errors
The continue_send() method in ipmi_bmc_extern.c directly
assigns the return value of qemu_chr_fe_write() to the
variable tracking the I/O buffer offset. This ignores the
possibility that the return value could be -1 and so will
cause I/O go backwards on EAGAIN. Fortunately 'outpos' is
unsigned, so can't go negative - it will become MAX_INT
which will cause the loop to stop, and avoid an accidental
out of bounds array access.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <1473170165-540-2-git-send-email-berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/ipmi')
| -rw-r--r-- | hw/ipmi/ipmi_bmc_extern.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/hw/ipmi/ipmi_bmc_extern.c b/hw/ipmi/ipmi_bmc_extern.c index 5b73983e7d..d93e3f3426 100644 --- a/hw/ipmi/ipmi_bmc_extern.c +++ b/hw/ipmi/ipmi_bmc_extern.c @@ -100,12 +100,16 @@ ipmb_checksum(const unsigned char *data, int size, unsigned char start) static void continue_send(IPMIBmcExtern *ibe) { + int ret; if (ibe->outlen == 0) { goto check_reset; } send: - ibe->outpos += qemu_chr_fe_write(ibe->chr, ibe->outbuf + ibe->outpos, - ibe->outlen - ibe->outpos); + ret = qemu_chr_fe_write(ibe->chr, ibe->outbuf + ibe->outpos, + ibe->outlen - ibe->outpos); + if (ret > 0) { + ibe->outpos += ret; + } if (ibe->outpos < ibe->outlen) { /* Not fully transmitted, try again in a 10ms */ timer_mod_ns(ibe->extern_timer, |