| Message ID | 20201030164450.1253641-2-arnd@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | None | expand |
On Fri, Oct 30, 2020 at 05:44:20PM +0100, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@arndb.de> > > It sounds unwise to let user space pass an unchecked 32-bit > offset into a kernel structure in an ioctl. This is an unsigned > variable, so checking the upper bound for the size of the structure > it points into is sufficient to avoid data corruption, but as > the pointer might also be unaligned, it has to be written carefully > as well. > > While I stumbled over this problem by reading the code, I did not > continue checking the function for further problems like it. > > Cc: <stable@vger.kernel.org> # v2.6.15+ > Fixes: c4a3e0a529ab ("[SCSI] MegaRAID SAS RAID: new driver") > Reviewed-by: Christoph Hellwig <hch@lst.de> > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > --- > drivers/scsi/megaraid/megaraid_sas_base.c | 15 ++++++++++----- > 1 file changed, 10 insertions(+), 5 deletions(-) > > diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c > index 41cd66fc7d81..b1b9a8823c8c 100644 > --- a/drivers/scsi/megaraid/megaraid_sas_base.c > +++ b/drivers/scsi/megaraid/megaraid_sas_base.c > @@ -8134,7 +8134,7 @@ megasas_mgmt_fw_ioctl(struct megasas_instance *instance, > int error = 0, i; > void *sense = NULL; > dma_addr_t sense_handle; > - unsigned long *sense_ptr; > + void *sense_ptr; > u32 opcode = 0; > int ret = DCMD_SUCCESS; > > @@ -8257,6 +8257,12 @@ megasas_mgmt_fw_ioctl(struct megasas_instance *instance, > } > > if (ioc->sense_len) { > + /* make sure the pointer is part of the frame */ > + if (ioc->sense_off > (sizeof(union megasas_frame) - sizeof(__le64))) { > + error = -EINVAL; This still has the overly long line.
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c index 41cd66fc7d81..b1b9a8823c8c 100644 --- a/drivers/scsi/megaraid/megaraid_sas_base.c +++ b/drivers/scsi/megaraid/megaraid_sas_base.c @@ -8134,7 +8134,7 @@ megasas_mgmt_fw_ioctl(struct megasas_instance *instance, int error = 0, i; void *sense = NULL; dma_addr_t sense_handle; - unsigned long *sense_ptr; + void *sense_ptr; u32 opcode = 0; int ret = DCMD_SUCCESS; @@ -8257,6 +8257,12 @@ megasas_mgmt_fw_ioctl(struct megasas_instance *instance, } if (ioc->sense_len) { + /* make sure the pointer is part of the frame */ + if (ioc->sense_off > (sizeof(union megasas_frame) - sizeof(__le64))) { + error = -EINVAL; + goto out; + } + sense = dma_alloc_coherent(&instance->pdev->dev, ioc->sense_len, &sense_handle, GFP_KERNEL); if (!sense) { @@ -8264,12 +8270,11 @@ megasas_mgmt_fw_ioctl(struct megasas_instance *instance, goto out; } - sense_ptr = - (unsigned long *) ((unsigned long)cmd->frame + ioc->sense_off); + sense_ptr = (void *)cmd->frame + ioc->sense_off; if (instance->consistent_mask_64bit) - *sense_ptr = cpu_to_le64(sense_handle); + put_unaligned_le64(sense_handle, sense_ptr); else - *sense_ptr = cpu_to_le32(sense_handle); + put_unaligned_le32(sense_handle, sense_ptr); } /*