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Commit cae8f234 authored by Dan Carpenter's avatar Dan Carpenter Committed by Greg Kroah-Hartman
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scsi: bfa: integer overflow in debugfs 




[ Upstream commit 3e351275655d3c84dc28abf170def9786db5176d ]

We could allocate less memory than intended because we do:

	bfad->regdata = kzalloc(len << 2, GFP_KERNEL);

The shift can overflow leading to a crash.  This is debugfs code so the
impact is very small.  I fixed the network version of this in March with
commit 13e2d5187f6b ("bna: integer overflow bug in debugfs").

Fixes: ab2a9ba1 ("[SCSI] bfa: add debugfs support")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 47e43e61

drivers/scsi/bfa/bfad_debugfs.c

+3 −2
Original line number Diff line number Diff line
@@ -254,7 +254,8 @@ bfad_debugfs_write_regrd(struct file *file, const char __user *buf, 
	struct bfad_s *bfad = port->bfad;

	struct bfa_s *bfa = &bfad->bfa;

	struct bfa_ioc_s *ioc = &bfa->ioc;

	int addr, len, rc, i;

	int addr, rc, i;

	u32 len;

	u32 *regbuf;

	void __iomem *rb, *reg_addr;

	unsigned long flags;
@@ -274,7 +275,7 @@ bfad_debugfs_write_regrd(struct file *file, const char __user *buf, 
	}



	rc = sscanf(kern_buf, "%x:%x", &addr, &len);

	if (rc < 2) {

	if (rc < 2 || len > (UINT_MAX >> 2)) {

		printk(KERN_INFO

			"bfad[%d]: %s failed to read user buf\n",

			bfad->inst_no, __func__);