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authorRainer Weikusat <rweikusat@mssgmbh.com>2009-06-18 17:04:00 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-06-20 12:22:47 +0200
commit39c58f37a10198054c656c28202fb1e6d22fd505 (patch)
treef0a321782a02f8fde4a68ffd8627771ff6be1e02
parent2c7eaa43c3bb7b3b9fe2051d17f308c1f0728c78 (diff)
downloadlinux-39c58f37a10198054c656c28202fb1e6d22fd505.tar.gz
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>
-rw-r--r--drivers/ide/ide-cd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 0b7645b13df..4a19686fcfe 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 */