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authorDan Carpenter <dan.carpenter@oracle.com>2015-10-19 14:19:01 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-05-04 14:48:51 -0700
commit4f8e29e7547be52fa24b0cdc7cf69baac9d82328 (patch)
tree49815b19ce5d9e4f84467039b69b4effd0b38cdb /drivers/misc
parent01c8261c5ec46183e14dec7df335ee88bb037e30 (diff)
misc: mic/scif: fix wrap around tests
commit 7b64dbf849abdd7e769820e25120758f956a7f13 upstream. Signed integer overflow is undefined. Also I added a check for "(offset < 0)" in scif_unregister() because that makes it match the other conditions and because I didn't want to subtract a negative. Fixes: ba612aa8b487 ('misc: mic: SCIF memory registration and unregistration') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/mic/scif/scif_rma.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/misc/mic/scif/scif_rma.c b/drivers/misc/mic/scif/scif_rma.c
index 8310b4dbff06..6a451bd65bf3 100644
--- a/drivers/misc/mic/scif/scif_rma.c
+++ b/drivers/misc/mic/scif/scif_rma.c
@@ -1511,7 +1511,7 @@ off_t scif_register_pinned_pages(scif_epd_t epd,
if ((map_flags & SCIF_MAP_FIXED) &&
((ALIGN(offset, PAGE_SIZE) != offset) ||
(offset < 0) ||
- (offset + (off_t)len < offset)))
+ (len > LONG_MAX - offset)))
return -EINVAL;
might_sleep();
@@ -1614,7 +1614,7 @@ off_t scif_register(scif_epd_t epd, void *addr, size_t len, off_t offset,
if ((map_flags & SCIF_MAP_FIXED) &&
((ALIGN(offset, PAGE_SIZE) != offset) ||
(offset < 0) ||
- (offset + (off_t)len < offset)))
+ (len > LONG_MAX - offset)))
return -EINVAL;
/* Unsupported protection requested */
@@ -1732,7 +1732,8 @@ scif_unregister(scif_epd_t epd, off_t offset, size_t len)
/* Offset is not page aligned or offset+len wraps around */
if ((ALIGN(offset, PAGE_SIZE) != offset) ||
- (offset + (off_t)len < offset))
+ (offset < 0) ||
+ (len > LONG_MAX - offset))
return -EINVAL;
err = scif_verify_epd(ep);