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| author | Patrick Georgi <patrick@georgi-clan.de> | 2014-12-29 20:37:45 +0100 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-01-03 23:58:23 +0100 |
| commit | 3cb56e934f9e52597cb70caea3aa6c84f192d445 (patch) | |
| tree | e1b6bbc629e153e1613ff1e8e62f6ae8d954fa19 | |
| parent | 8180d1a22f54f2a792c9187d98d15b2501d35aa7 (diff) | |
| download | coreboot-3cb56e934f9e52597cb70caea3aa6c84f192d445.tar.xz | |
libpayload: avoid memory overflows
With commands typically shorter than the buffer they're
copied to, copy cmdlen bytes, cut off by the buffer limit.
Change-Id: Ia9d2663bd145eff4538084ac1ef8850cfbcea924
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Found-by: Coverity Scan
Reviewed-on: http://review.coreboot.org/7977
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
| -rw-r--r-- | payloads/libpayload/drivers/usb/usbmsc.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/usb/usbmsc.c b/payloads/libpayload/drivers/usb/usbmsc.c index 62428b6ebe..ccd693a84d 100644 --- a/payloads/libpayload/drivers/usb/usbmsc.c +++ b/payloads/libpayload/drivers/usb/usbmsc.c @@ -200,6 +200,11 @@ wrap_cbw (cbw_t *cbw, int datalen, cbw_direction dir, const u8 *cmd, { memset (cbw, 0, sizeof (cbw_t)); + /* commands are typically shorter, but we don't want overflows */ + if (cmdlen > sizeof(cbw->CBWCB)) { + cmdlen = sizeof(cbw->CBWCB); + } + cbw->dCBWSignature = cbw_signature; cbw->dCBWTag = ++tag; cbw->bCBWLUN = lun; |