From: Christophe JAILLET Date: Mon, 27 Jun 2016 19:06:51 +0000 (+0200) Subject: ALSA: echoaudio: Fix memory allocation X-Git-Tag: v3.16.37~65 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=db92ce5d03426443f8e1e82279bbd306bd1b2327;p=thirdparty%2Fkernel%2Fstable.git ALSA: echoaudio: Fix memory allocation commit 9c6795a9b3cbb56a9fbfaf43909c5c22999ba317 upstream. 'commpage_bak' is allocated with 'sizeof(struct echoaudio)' bytes. We then copy 'sizeof(struct comm_page)' bytes in it. On my system, smatch complains because one is 2960 and the other is 3072. This would result in memory corruption or a oops. Signed-off-by: Christophe JAILLET Signed-off-by: Takashi Iwai [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings --- diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c index 9f10c9e0df5e8..2838de08be9b0 100644 --- a/sound/pci/echoaudio/echoaudio.c +++ b/sound/pci/echoaudio/echoaudio.c @@ -2253,11 +2253,11 @@ static int snd_echo_resume(struct device *dev) DE_INIT(("resume start\n")); pci_restore_state(pci); - commpage_bak = kmalloc(sizeof(struct echoaudio), GFP_KERNEL); + commpage_bak = kmalloc(sizeof(*commpage), GFP_KERNEL); if (commpage_bak == NULL) return -ENOMEM; commpage = chip->comm_page; - memcpy(commpage_bak, commpage, sizeof(struct comm_page)); + memcpy(commpage_bak, commpage, sizeof(*commpage)); err = init_hw(chip, chip->pci->device, chip->pci->subsystem_device); if (err < 0) {