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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2017-04-03 14:13:55 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2017-04-05 21:37:23 +0200 |
| commit | 7e1621de146fbed6172252f14a6a41b2c5999a93 (patch) | |
| tree | 244737dfe7058e9e958aee74358526c2656d5106 /sound/firewire/oxfw/oxfw-command.c | |
| parent | ALSA: firewire-motu: remove invalid bitshift for register value (diff) | |
| download | linux-7e1621de146fbed6172252f14a6a41b2c5999a93.tar.xz linux-7e1621de146fbed6172252f14a6a41b2c5999a93.zip | |
ALSA: firewire-lib/bebob/oxfw: improve response evaluation for AV/C commands
In ALSA firewire stack, some AV/C commands are supported, including
vendor's extensions. Drivers includes response parser of each command,
according to its requirements, while the parser is written with loose
fashion in two points; error check and length check. This doesn't cause
any issues such as kernel corruption, but should be improved.
This commit modifies evaluations of return value on each parsers.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to '')
| -rw-r--r-- | sound/firewire/oxfw/oxfw-command.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/sound/firewire/oxfw/oxfw-command.c b/sound/firewire/oxfw/oxfw-command.c index 12ef3253bc89..ac3e2e301666 100644 --- a/sound/firewire/oxfw/oxfw-command.c +++ b/sound/firewire/oxfw/oxfw-command.c @@ -34,7 +34,9 @@ int avc_stream_set_format(struct fw_unit *unit, enum avc_general_plug_dir dir, err = fcp_avc_transaction(unit, buf, len + 10, buf, len + 10, BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) | BIT(6) | BIT(7) | BIT(8)); - if ((err > 0) && (err < len + 10)) + if (err < 0) + ; + else if (err < len + 10) err = -EIO; else if (buf[0] == 0x08) /* NOT IMPLEMENTED */ err = -ENOSYS; @@ -77,7 +79,9 @@ int avc_stream_get_format(struct fw_unit *unit, err = fcp_avc_transaction(unit, buf, 12, buf, *len, BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) | BIT(6) | BIT(7)); - if ((err > 0) && (err < 10)) + if (err < 0) + ; + else if (err < 12) err = -EIO; else if (buf[0] == 0x08) /* NOT IMPLEMENTED */ err = -ENOSYS; @@ -139,7 +143,9 @@ int avc_general_inquiry_sig_fmt(struct fw_unit *unit, unsigned int rate, /* do transaction and check buf[1-5] are the same against command */ err = fcp_avc_transaction(unit, buf, 8, buf, 8, BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5)); - if ((err > 0) && (err < 8)) + if (err < 0) + ; + else if (err < 8) err = -EIO; else if (buf[0] == 0x08) /* NOT IMPLEMENTED */ err = -ENOSYS; |