[alsa-devel] [PATCH] ALSA: firewire-lib/bebob/oxfw: improve response evaluation for AV/C commands
Takashi Sakamoto
o-takashi at sakamocchi.jp
Mon Apr 3 14:13:55 CEST 2017
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 at oracle.com>
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
sound/firewire/bebob/bebob_command.c | 30 ++++++++++++++++++++++--------
sound/firewire/fcp.c | 12 +++++++++---
sound/firewire/oxfw/oxfw-command.c | 12 +++++++++---
3 files changed, 40 insertions(+), 14 deletions(-)
diff --git a/sound/firewire/bebob/bebob_command.c b/sound/firewire/bebob/bebob_command.c
index 9402cc1..f9b4225 100644
--- a/sound/firewire/bebob/bebob_command.c
+++ b/sound/firewire/bebob/bebob_command.c
@@ -31,13 +31,15 @@ int avc_audio_set_selector(struct fw_unit *unit, unsigned int subunit_id,
err = fcp_avc_transaction(unit, buf, 12, buf, 12,
BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) |
BIT(6) | BIT(7) | BIT(8));
- if (err > 0 && err < 9)
+ if (err < 0)
+ ;
+ else if (err < 9)
err = -EIO;
else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
err = -ENOSYS;
else if (buf[0] == 0x0a) /* REJECTED */
err = -EINVAL;
- else if (err > 0)
+ else
err = 0;
kfree(buf);
@@ -67,7 +69,9 @@ int avc_audio_get_selector(struct fw_unit *unit, unsigned int subunit_id,
err = fcp_avc_transaction(unit, buf, 12, buf, 12,
BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) |
BIT(6) | BIT(8));
- if (err > 0 && err < 9)
+ if (err < 0)
+ ;
+ else if (err < 9)
err = -EIO;
else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
err = -ENOSYS;
@@ -120,7 +124,9 @@ int avc_bridgeco_get_plug_type(struct fw_unit *unit,
err = fcp_avc_transaction(unit, buf, 12, buf, 12,
BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) |
BIT(6) | BIT(7) | BIT(9));
- if ((err >= 0) && (err < 8))
+ if (err < 0)
+ ;
+ else if (err < 11)
err = -EIO;
else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
err = -ENOSYS;
@@ -150,7 +156,9 @@ int avc_bridgeco_get_plug_ch_pos(struct fw_unit *unit,
err = fcp_avc_transaction(unit, buf, 12, buf, 256,
BIT(1) | BIT(2) | BIT(3) | BIT(4) |
BIT(5) | BIT(6) | BIT(7) | BIT(9));
- if ((err >= 0) && (err < 8))
+ if (err < 0)
+ ;
+ else if (err < 11)
err = -EIO;
else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
err = -ENOSYS;
@@ -187,7 +195,9 @@ int avc_bridgeco_get_plug_section_type(struct fw_unit *unit,
err = fcp_avc_transaction(unit, buf, 12, buf, 12,
BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) |
BIT(6) | BIT(7) | BIT(9) | BIT(10));
- if ((err >= 0) && (err < 8))
+ if (err < 0)
+ ;
+ else if (err < 12)
err = -EIO;
else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
err = -ENOSYS;
@@ -221,7 +231,9 @@ int avc_bridgeco_get_plug_input(struct fw_unit *unit,
err = fcp_avc_transaction(unit, buf, 16, buf, 16,
BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5) |
BIT(6) | BIT(7));
- if ((err >= 0) && (err < 8))
+ if (err < 0)
+ ;
+ else if (err < 16)
err = -EIO;
else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
err = -ENOSYS;
@@ -260,7 +272,9 @@ int avc_bridgeco_get_plug_strm_fmt(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) | BIT(10));
- if ((err >= 0) && (err < 12))
+ if (err < 0)
+ ;
+ else if (err < 12)
err = -EIO;
else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
err = -ENOSYS;
diff --git a/sound/firewire/fcp.c b/sound/firewire/fcp.c
index cce1976..61dda82 100644
--- a/sound/firewire/fcp.c
+++ b/sound/firewire/fcp.c
@@ -63,7 +63,9 @@ int avc_general_set_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;
@@ -106,7 +108,9 @@ int avc_general_get_sig_fmt(struct fw_unit *unit, unsigned int *rate,
/* do transaction and check buf[1-4] are the same against command */
err = fcp_avc_transaction(unit, buf, 8, buf, 8,
BIT(1) | BIT(2) | BIT(3) | BIT(4));
- if (err >= 0 && err < 8)
+ if (err < 0)
+ ;
+ else if (err < 8)
err = -EIO;
else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
err = -ENOSYS;
@@ -154,7 +158,9 @@ int avc_general_get_plug_info(struct fw_unit *unit, unsigned int subunit_type,
buf[3] = 0xff & subfunction;
err = fcp_avc_transaction(unit, buf, 8, buf, 8, BIT(1) | BIT(2));
- if (err >= 0 && err < 8)
+ if (err < 0)
+ ;
+ else if (err < 8)
err = -EIO;
else if (buf[0] == 0x08) /* NOT IMPLEMENTED */
err = -ENOSYS;
diff --git a/sound/firewire/oxfw/oxfw-command.c b/sound/firewire/oxfw/oxfw-command.c
index 12ef325..ac3e2e3 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;
--
2.9.3
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