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ide-cd: Do not access completed requests in the irq handler 

ide_cd_error_cmd() can complete an erroneous request with leftover
buffers. Signal this with its return value so that the request is not
accessed after its completion in the irq handler and we oops.

Cc: <stable@kernel.org> # 32.x 33.x 34.x
Signed-off-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Borislav Petkov 2010-07-05 21:23:52 -07:00 committed by David S. Miller
parent 45d7f32c7a
commit 1107128283
1 changed files with 11 additions and 3 deletions
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14
drivers/ide/ide-cd.c
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@ -506,15 +506,22 @@ int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
return (flags & REQ_FAILED) ? -EIO : 0; return (flags & REQ_FAILED) ? -EIO : 0;
} }
static void ide_cd_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd) /*
* returns true if rq has been completed
*/
static bool ide_cd_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
{ {
unsigned int nr_bytes = cmd->nbytes - cmd->nleft; unsigned int nr_bytes = cmd->nbytes - cmd->nleft;
if (cmd->tf_flags & IDE_TFLAG_WRITE) if (cmd->tf_flags & IDE_TFLAG_WRITE)
nr_bytes -= cmd->last_xfer_len; nr_bytes -= cmd->last_xfer_len;
if (nr_bytes > 0) if (nr_bytes > 0) {
ide_complete_rq(drive, 0, nr_bytes); ide_complete_rq(drive, 0, nr_bytes);
return true;
}
return false;
} }
static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive) static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
@ -679,7 +686,8 @@ out_end:
} }
if (uptodate == 0 && rq->bio) if (uptodate == 0 && rq->bio)
ide_cd_error_cmd(drive, cmd); if (ide_cd_error_cmd(drive, cmd))
return ide_stopped;
/* make sure it's fully ended */ /* make sure it's fully ended */
if (blk_fs_request(rq) == 0) { if (blk_fs_request(rq) == 0) {