Messages in this thread | | | Date | Wed, 3 Apr 2024 16:09:15 -0700 | Subject | Re: [PATCH] scsi: lpfc: Fix a possible null pointer dereference | From | Bart Van Assche <> |
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On 4/2/24 6:40 PM, Huai-Yuan Liu wrote: > In function lpfc_xcvr_data_show, the memory allocation with kmalloc might > fail, thereby making rdp_context a null pointer. In the following context > and functions that use this pointer, there are dereferencing operations, > leading to null pointer dereference. > > To fix this issue, a null pointer check should be added. If it is null, > write error message and jump to 'out_free_rdp'. > > Fixes: 479b0917e447 ("scsi: lpfc: Create a sysfs entry called lpfc_xcvr_data for transceiver info") > Signed-off-by: Huai-Yuan Liu <qq810974084@gmail.com> > --- > drivers/scsi/lpfc/lpfc_attr.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c > index b1c9107d3408..b11e5114b7f2 100644 > --- a/drivers/scsi/lpfc/lpfc_attr.c > +++ b/drivers/scsi/lpfc/lpfc_attr.c > @@ -1904,6 +1904,11 @@ lpfc_xcvr_data_show(struct device *dev, struct device_attribute *attr, > > /* Get transceiver information */ > rdp_context = kmalloc(sizeof(*rdp_context), GFP_KERNEL); > + if (!rdp_context) { > + len = scnprintf(buf, PAGE_SIZE - len, > + "ERROR: Not enough memory\n"); > + goto out_free_rdp; > + } >
Has this patch been verified with checkpatch? Checkpatch should have reported the following for the above patch:
Possible unnecessary 'out of memory' message
Thanks,
Bart.
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