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sym53c8xx: Fix NULL pointer dereference in slave_destroy

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commit cced5041ed upstream.

sym53c8xx_slave_destroy unconditionally assumes that sym53c8xx_slave_alloc has
succesesfully allocated a sym_lcb. This can lead to a NULL pointer dereference
(exposed by commit 4e6c82b).

Signed-off-by: Stratos Psomadakis <psomas@gentoo.org>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Stratos Psomadakis 2011-12-04 02:23:54 +02:00 committed by Willy Tarreau
parent e9a7f3230d
commit 64494d9f15
1 changed files with 4 additions and 0 deletions
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4
drivers/scsi/sym53c8xx_2/sym_glue.c
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@ -821,6 +821,10 @@ static void sym53c8xx_slave_destroy(struct scsi_device *sdev)
struct sym_hcb *np = sym_get_hcb(sdev->host);
struct sym_lcb *lp = sym_lp(&np->target[sdev->id], sdev->lun);
/* if slave_alloc returned before allocating a sym_lcb, return */
if (!lp)
return;
if (lp->itlq_tbl)
sym_mfree_dma(lp->itlq_tbl, SYM_CONF_MAX_TASK * 4, "ITLQ_TBL");
kfree(lp->cb_tags);