From 6da2ec56059c3c7a7e5f729e6349e74ace1e5c57 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Tue, 12 Jun 2018 13:55:00 -0700 Subject: treewide: kmalloc() -> kmalloc_array() The kmalloc() function has a 2-factor argument form, kmalloc_array(). This patch replaces cases of: kmalloc(a * b, gfp) with: kmalloc_array(a * b, gfp) as well as handling cases of: kmalloc(a * b * c, gfp) with: kmalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kmalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kmalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The tools/ directory was manually excluded, since it has its own implementation of kmalloc(). The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kmalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kmalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kmalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kmalloc( - sizeof(u8) * COUNT + COUNT , ...) | kmalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kmalloc( - sizeof(char) * COUNT + COUNT , ...) | kmalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kmalloc + kmalloc_array ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kmalloc + kmalloc_array ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kmalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kmalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kmalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kmalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kmalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kmalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kmalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kmalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kmalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kmalloc(C1 * C2 * C3, ...) | kmalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kmalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kmalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kmalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kmalloc(sizeof(THING) * C2, ...) | kmalloc(sizeof(TYPE) * C2, ...) | kmalloc(C1 * C2 * C3, ...) | kmalloc(C1 * C2, ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kmalloc + kmalloc_array ( - (E1) * E2 + E1, E2 , ...) | - kmalloc + kmalloc_array ( - (E1) * (E2) + E1, E2 , ...) | - kmalloc + kmalloc_array ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook --- drivers/char/agp/compat_ioctl.c | 8 ++++++-- drivers/char/agp/isoch.c | 3 ++- drivers/char/agp/sgi-agp.c | 6 +++--- drivers/char/agp/uninorth-agp.c | 4 +++- drivers/char/virtio_console.c | 15 ++++++++------- 5 files changed, 22 insertions(+), 14 deletions(-) (limited to 'drivers/char') diff --git a/drivers/char/agp/compat_ioctl.c b/drivers/char/agp/compat_ioctl.c index 2053f70ef66b..52ffe1706ce0 100644 --- a/drivers/char/agp/compat_ioctl.c +++ b/drivers/char/agp/compat_ioctl.c @@ -98,11 +98,15 @@ static int compat_agpioc_reserve_wrap(struct agp_file_private *priv, void __user if (ureserve.seg_count >= 16384) return -EINVAL; - usegment = kmalloc(sizeof(*usegment) * ureserve.seg_count, GFP_KERNEL); + usegment = kmalloc_array(ureserve.seg_count, + sizeof(*usegment), + GFP_KERNEL); if (!usegment) return -ENOMEM; - ksegment = kmalloc(sizeof(*ksegment) * kreserve.seg_count, GFP_KERNEL); + ksegment = kmalloc_array(kreserve.seg_count, + sizeof(*ksegment), + GFP_KERNEL); if (!ksegment) { kfree(usegment); return -ENOMEM; diff --git a/drivers/char/agp/isoch.c b/drivers/char/agp/isoch.c index fc8e1bc3347d..31c374b1b91b 100644 --- a/drivers/char/agp/isoch.c +++ b/drivers/char/agp/isoch.c @@ -93,7 +93,8 @@ static int agp_3_5_isochronous_node_enable(struct agp_bridge_data *bridge, * We'll work with an array of isoch_data's (one for each * device in dev_list) throughout this function. */ - if ((master = kmalloc(ndevs * sizeof(*master), GFP_KERNEL)) == NULL) { + master = kmalloc_array(ndevs, sizeof(*master), GFP_KERNEL); + if (master == NULL) { ret = -ENOMEM; goto get_out; } diff --git a/drivers/char/agp/sgi-agp.c b/drivers/char/agp/sgi-agp.c index 3051c73bc383..e7d5bdc02d93 100644 --- a/drivers/char/agp/sgi-agp.c +++ b/drivers/char/agp/sgi-agp.c @@ -280,9 +280,9 @@ static int agp_sgi_init(void) else return 0; - sgi_tioca_agp_bridges = kmalloc(tioca_gart_found * - sizeof(struct agp_bridge_data *), - GFP_KERNEL); + sgi_tioca_agp_bridges = kmalloc_array(tioca_gart_found, + sizeof(struct agp_bridge_data *), + GFP_KERNEL); if (!sgi_tioca_agp_bridges) return -ENOMEM; diff --git a/drivers/char/agp/uninorth-agp.c b/drivers/char/agp/uninorth-agp.c index 79d8c84693a1..31fcd0430426 100644 --- a/drivers/char/agp/uninorth-agp.c +++ b/drivers/char/agp/uninorth-agp.c @@ -402,7 +402,9 @@ static int uninorth_create_gatt_table(struct agp_bridge_data *bridge) if (table == NULL) return -ENOMEM; - uninorth_priv.pages_arr = kmalloc((1 << page_order) * sizeof(struct page*), GFP_KERNEL); + uninorth_priv.pages_arr = kmalloc_array(1 << page_order, + sizeof(struct page *), + GFP_KERNEL); if (uninorth_priv.pages_arr == NULL) goto enomem; diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 4bf7c06c2343..17084cfcf53e 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -1891,13 +1891,14 @@ static int init_vqs(struct ports_device *portdev) nr_ports = portdev->max_nr_ports; nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; - vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); - io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); - io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); - portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), - GFP_KERNEL); - portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), - GFP_KERNEL); + vqs = kmalloc_array(nr_queues, sizeof(struct virtqueue *), GFP_KERNEL); + io_callbacks = kmalloc_array(nr_queues, sizeof(vq_callback_t *), + GFP_KERNEL); + io_names = kmalloc_array(nr_queues, sizeof(char *), GFP_KERNEL); + portdev->in_vqs = kmalloc_array(nr_ports, sizeof(struct virtqueue *), + GFP_KERNEL); + portdev->out_vqs = kmalloc_array(nr_ports, sizeof(struct virtqueue *), + GFP_KERNEL); if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || !portdev->out_vqs) { err = -ENOMEM; -- cgit v1.2.1