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scsi: ses: Fix possible desc_ptr out-of-bounds accesses

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Sanitize possible desc_ptr out-of-bounds accesses in
ses_enclosure_data_process().

Link: https://lore.kernel.org/r/20230202162451.15346-4-thenzl@redhat.com
Cc: stable@vger.kernel.org
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Tomas Henzl 2023-02-02 17:24:50 +01:00 committed by Martin K. Petersen
parent db95d4df71
commit 801ab13d50
1 changed files with 9 additions and 5 deletions
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14
drivers/scsi/ses.c
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@ -578,15 +578,19 @@ static void ses_enclosure_data_process(struct enclosure_device *edev,
int max_desc_len;
if (desc_ptr) {
if (desc_ptr >= buf + page7_len) {
if (desc_ptr + 3 >= buf + page7_len) {
desc_ptr = NULL;
} else {
len = (desc_ptr[2] << 8) + desc_ptr[3];
desc_ptr += 4;
/* Add trailing zero - pushes into
* reserved space */
desc_ptr[len] = '\0';
name = desc_ptr;
if (desc_ptr + len > buf + page7_len)
desc_ptr = NULL;
else {
/* Add trailing zero - pushes into
* reserved space */
desc_ptr[len] = '\0';
name = desc_ptr;
}
}
}
if (type_ptr[0] == ENCLOSURE_COMPONENT_DEVICE ||