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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2015-10-19 14:19:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-02-07 21:25:50 -0800 |
| commit | 7b64dbf849abdd7e769820e25120758f956a7f13 (patch) | |
| tree | 34827fb9a211f2858d3a44616d37e0f7df0c15a4 /drivers/misc/mic/scif/scif_rma.c | |
| parent | 269ad6e018146dafb70c9a40e546f73752d44db2 (diff) | |
| download | linux-7b64dbf849abdd7e769820e25120758f956a7f13.tar.gz linux-7b64dbf849abdd7e769820e25120758f956a7f13.tar.xz | |
misc: mic/scif: fix wrap around tests
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/mic/scif/scif_rma.c')
| -rw-r--r-- | drivers/misc/mic/scif/scif_rma.c | 7 |
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); |