libata: add missing NULL pointer check to ata_eh_reset()

drivers/ata/libata-eh.c +2403 ata_eh_reset(80) warning: variable derefenced before check 'slave'

Please note that this is _not_ a real bug at the moment since ata_eh_context
structure is embedded into ata_list structure and the code alwas checks for
'slave' before accessing 'sehc'.

Anyway lets add missing check and always have a valid 'sehc' pointer (which
makes code easier to understand and prevents introducing some possible bugs
in the future).

Reported-by: Dan Carpenter <error27@gmail.com>
Cc: corbet@lwn.net
Cc: eteo@redhat.com
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 1a07c061f644f37d76e7efe831a028ff6b8c1953..79711b64054bde8d3d5815fc09aeca08ad3bf00d 100644 (file)
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2327,7 +2327,7 @@ int ata_eh_reset(struct ata_link *link, int classify,
        struct ata_port *ap = link->ap;
        struct ata_link *slave = ap->slave_link;
        struct ata_eh_context *ehc = &link->eh_context;
-       struct ata_eh_context *sehc = &slave->eh_context;
+       struct ata_eh_context *sehc = slave ? &slave->eh_context : NULL;
        unsigned int *classes = ehc->classes;
        unsigned int lflags = link->flags;
        int verbose = !(ehc->i.flags & ATA_EHI_QUIET);