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| author | Rainer Weikusat <rweikusat@mssgmbh.com> | 2009-06-18 17:04:00 +0200 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-06-20 12:22:47 +0200 |
| commit | 39c58f37a10198054c656c28202fb1e6d22fd505 (patch) | |
| tree | f0a321782a02f8fde4a68ffd8627771ff6be1e02 /drivers/ide | |
| parent | 2c7eaa43c3bb7b3b9fe2051d17f308c1f0728c78 (diff) | |
| download | lwn-39c58f37a10198054c656c28202fb1e6d22fd505.tar.gz lwn-39c58f37a10198054c656c28202fb1e6d22fd505.zip | |
ide-cd: prevent null pointer deref via cdrom_newpc_intr
With 2.6.30, the error handling code in cdrom_newpc_intr was changed
to deal with partial request failures by normally completing the 'good'
parts of a request and only 'error' the last (and presumably,
incompletely transferred) bio associated with a particular
request. In order to do this, ide_complete_rq is called over
ide_cd_error_cmd() to partially complete the rq. The block layer
does partial completion only for requests with bio's and if the
rq doesn't have one (eg 'GPCMD_READ_DISC_INFO') the request is
completed as a whole and the drive->hwif->rq pointer set to NULL
afterwards. When calling ide_complete_rq again to report
the error, this null pointer is derefenced, resulting in a kernel
crash.
This fixes http://bugzilla.kernel.org/show_bug.cgi?id=13399.
Signed-off-by: Rainer Weikusat <rweikusat@mssgmbh.com>
Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide')
| -rw-r--r-- | drivers/ide/ide-cd.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c index 0b7645b13df1..4a19686fcfe9 100644 --- a/drivers/ide/ide-cd.c +++ b/drivers/ide/ide-cd.c @@ -667,7 +667,7 @@ out_end: rq->errors = -EIO; } - if (uptodate == 0) + if (uptodate == 0 && rq->bio) ide_cd_error_cmd(drive, cmd); /* make sure it's fully ended */ |