30 lines
1.0 KiB
Diff
30 lines
1.0 KiB
Diff
From: peter chang <dpf@google.com>
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Date: Wed, 15 Feb 2017 14:11:54 -0800
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Subject: scsi: sg: check length passed to SG_NEXT_CMD_LEN
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Origin: https://git.kernel.org/cgit/linux/kernel/git/mkp/scsi.git/commit?id=bf33f87dd04c371ea33feb821b60d63d754e3124
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Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2017-7187
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The user can control the size of the next command passed along, but the
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value passed to the ioctl isn't checked against the usable max command
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size.
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Cc: <stable@vger.kernel.org>
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Signed-off-by: Peter Chang <dpf@google.com>
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Acked-by: Douglas Gilbert <dgilbert@interlog.com>
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Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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---
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drivers/scsi/sg.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/drivers/scsi/sg.c
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+++ b/drivers/scsi/sg.c
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@@ -998,6 +998,8 @@ sg_ioctl(struct file *filp, unsigned int
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result = get_user(val, ip);
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if (result)
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return result;
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+ if (val > SG_MAX_CDB_SIZE)
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+ return -ENOMEM;
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sfp->next_cmd_len = (val > 0) ? val : 0;
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return 0;
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case SG_GET_VERSION_NUM:
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