[127/190] Revert "ALSA: sb8: add a check for request_region"
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Message ID 20210421130105.1226686-128-gregkh@linuxfoundation.org
State New, archived
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Series
  • Revertion of all of the umn.edu commits
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Commit Message

Greg KH April 21, 2021, 1 p.m. UTC
This reverts commit dcd0feac9bab901d5739de51b3f69840851f8919.

Commits from @umn.edu addresses have been found to be submitted in "bad
faith" to try to test the kernel community's ability to review "known
malicious" changes.  The result of these submissions can be found in a
paper published at the 42nd IEEE Symposium on Security and Privacy
entitled, "Open Source Insecurity: Stealthily Introducing
Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
of Minnesota) and Kangjie Lu (University of Minnesota).

Because of this, all submissions from this group must be reverted from
the kernel tree and will need to be re-reviewed again to determine if
they actually are a valid fix.  Until that work is complete, remove this
change to ensure that no problems are being introduced into the
codebase.

Cc: Kangjie Lu <kjlu@umn.edu>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 sound/isa/sb/sb8.c | 4 ----
 1 file changed, 4 deletions(-)

Comments

Takashi Iwai April 21, 2021, 4:21 p.m. UTC | #1
On Wed, 21 Apr 2021 15:00:02 +0200,
Greg Kroah-Hartman wrote:
> 
> This reverts commit dcd0feac9bab901d5739de51b3f69840851f8919.
> 
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
> 
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
> 
> Cc: Kangjie Lu <kjlu@umn.edu>
> Cc: Takashi Iwai <tiwai@suse.de>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This code change itself looks OK, OTOH, the original commit message is
slightly wrong: the code path can never result in NULL deference in
this case, as it's just an optional resource reservation.  So, it's
safe to revert this.


thanks,

Takashi

> ---
>  sound/isa/sb/sb8.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/sound/isa/sb/sb8.c b/sound/isa/sb/sb8.c
> index 6c9d534ce8b6..95290ffe5c6e 100644
> --- a/sound/isa/sb/sb8.c
> +++ b/sound/isa/sb/sb8.c
> @@ -95,10 +95,6 @@ static int snd_sb8_probe(struct device *pdev, unsigned int dev)
>  
>  	/* block the 0x388 port to avoid PnP conflicts */
>  	acard->fm_res = request_region(0x388, 4, "SoundBlaster FM");
> -	if (!acard->fm_res) {
> -		err = -EBUSY;
> -		goto _err;
> -	}
>  
>  	if (port[dev] != SNDRV_AUTO_PORT) {
>  		if ((err = snd_sbdsp_create(card, port[dev], irq[dev],
> -- 
> 2.31.1
>
Greg KH April 27, 2021, 1:51 p.m. UTC | #2
On Wed, Apr 21, 2021 at 06:21:26PM +0200, Takashi Iwai wrote:
> On Wed, 21 Apr 2021 15:00:02 +0200,
> Greg Kroah-Hartman wrote:
> > 
> > This reverts commit dcd0feac9bab901d5739de51b3f69840851f8919.
> > 
> > Commits from @umn.edu addresses have been found to be submitted in "bad
> > faith" to try to test the kernel community's ability to review "known
> > malicious" changes.  The result of these submissions can be found in a
> > paper published at the 42nd IEEE Symposium on Security and Privacy
> > entitled, "Open Source Insecurity: Stealthily Introducing
> > Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> > of Minnesota) and Kangjie Lu (University of Minnesota).
> > 
> > Because of this, all submissions from this group must be reverted from
> > the kernel tree and will need to be re-reviewed again to determine if
> > they actually are a valid fix.  Until that work is complete, remove this
> > change to ensure that no problems are being introduced into the
> > codebase.
> > 
> > Cc: Kangjie Lu <kjlu@umn.edu>
> > Cc: Takashi Iwai <tiwai@suse.de>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> 
> This code change itself looks OK, OTOH, the original commit message is
> slightly wrong: the code path can never result in NULL deference in
> this case, as it's just an optional resource reservation.  So, it's
> safe to revert this.

Thanks for the review!

greg k-h

Patch
diff mbox series

diff --git a/sound/isa/sb/sb8.c b/sound/isa/sb/sb8.c
index 6c9d534ce8b6..95290ffe5c6e 100644
--- a/sound/isa/sb/sb8.c
+++ b/sound/isa/sb/sb8.c
@@ -95,10 +95,6 @@  static int snd_sb8_probe(struct device *pdev, unsigned int dev)
 
 	/* block the 0x388 port to avoid PnP conflicts */
 	acard->fm_res = request_region(0x388, 4, "SoundBlaster FM");
-	if (!acard->fm_res) {
-		err = -EBUSY;
-		goto _err;
-	}
 
 	if (port[dev] != SNDRV_AUTO_PORT) {
 		if ((err = snd_sbdsp_create(card, port[dev], irq[dev],