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authorDan Carpenter <dan.carpenter@oracle.com>2017-10-04 10:50:37 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2017-10-16 22:35:13 -0400
commit3e351275655d3c84dc28abf170def9786db5176d (patch)
tree88f0f09591a36ad920c5020f4293f3fc27c977ae /drivers/scsi/bfa
parent2269848386c4b8395bc67eaaf7d08011da7c07ef (diff)
scsi: bfa: integer overflow in debugfs
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: ab2a9ba189e8 ("[SCSI] bfa: add debugfs support") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/bfa')
-rw-r--r--drivers/scsi/bfa/bfad_debugfs.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/scsi/bfa/bfad_debugfs.c b/drivers/scsi/bfa/bfad_debugfs.c
index 8dcd8c70c7ee..05f523971348 100644
--- a/drivers/scsi/bfa/bfad_debugfs.c
+++ b/drivers/scsi/bfa/bfad_debugfs.c
@@ -255,7 +255,8 @@ 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;
@@ -266,7 +267,7 @@ bfad_debugfs_write_regrd(struct file *file, const char __user *buf,
return PTR_ERR(kern_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__);