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scsi: megaraid_sas: Check user-provided offsets 

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.

Link: https://lore.kernel.org/r/20201030164450.1253641-2-arnd@kernel.org
Fixes: c4a3e0a529 ("[SCSI] MegaRAID SAS RAID: new driver")
Cc: <stable@vger.kernel.org> # v2.6.15+
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
zero-sugar-mainline-defconfig
Arnd Bergmann 2020-10-30 17:44:20 +01:00 committed by Martin K. Petersen
parent 077054215a
commit 381d34e376
1 changed files with 11 additions and 5 deletions
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16
drivers/scsi/megaraid/megaraid_sas_base.c
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@ -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 +8257,13 @@ 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 +8271,11 @@ 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);
}
/*