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author | Rainer Weikusat <rweikusat@mssgmbh.com> | 2009-06-18 17:04:00 +0200 |
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committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-06-20 12:22:47 +0200 |
commit | 39c58f37a10198054c656c28202fb1e6d22fd505 (patch) | |
tree | f0a321782a02f8fde4a68ffd8627771ff6be1e02 /COPYING | |
parent | 2c7eaa43c3bb7b3b9fe2051d17f308c1f0728c78 (diff) |
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 'COPYING')
0 files changed, 0 insertions, 0 deletions