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/md/dm-integrity.c | 3 ++- drivers/md/dm-snap.c | 9 +++++---- drivers/md/dm-stats.c | 4 +++- drivers/md/dm-table.c | 2 +- drivers/md/md-bitmap.c | 4 ++-- drivers/md/raid1.c | 4 ++-- drivers/md/raid10.c | 2 +- 7 files changed, 16 insertions(+), 12 deletions(-) (limited to 'drivers/md') diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c index fc68c7aaef8e..136e7e66d870 100644 --- a/drivers/md/dm-integrity.c +++ b/drivers/md/dm-integrity.c @@ -2743,7 +2743,8 @@ static int create_journal(struct dm_integrity_c *ic, char **error) r = -ENOMEM; goto bad; } - section_req->iv = kmalloc(ivsize * 2, GFP_KERNEL); + section_req->iv = kmalloc_array(ivsize, 2, + GFP_KERNEL); if (!section_req->iv) { skcipher_request_free(section_req); *error = "Unable to allocate iv"; diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index f745404da721..97de7a7334d4 100644 --- a/drivers/md/dm-snap.c +++ b/drivers/md/dm-snap.c @@ -326,8 +326,8 @@ static int init_origin_hash(void) { int i; - _origins = kmalloc(ORIGIN_HASH_SIZE * sizeof(struct list_head), - GFP_KERNEL); + _origins = kmalloc_array(ORIGIN_HASH_SIZE, sizeof(struct list_head), + GFP_KERNEL); if (!_origins) { DMERR("unable to allocate memory for _origins"); return -ENOMEM; @@ -335,8 +335,9 @@ static int init_origin_hash(void) for (i = 0; i < ORIGIN_HASH_SIZE; i++) INIT_LIST_HEAD(_origins + i); - _dm_origins = kmalloc(ORIGIN_HASH_SIZE * sizeof(struct list_head), - GFP_KERNEL); + _dm_origins = kmalloc_array(ORIGIN_HASH_SIZE, + sizeof(struct list_head), + GFP_KERNEL); if (!_dm_origins) { DMERR("unable to allocate memory for _dm_origins"); kfree(_origins); diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c index 56059fb56e2d..21de30b4e2a1 100644 --- a/drivers/md/dm-stats.c +++ b/drivers/md/dm-stats.c @@ -915,7 +915,9 @@ static int parse_histogram(const char *h, unsigned *n_histogram_entries, if (*q == ',') (*n_histogram_entries)++; - *histogram_boundaries = kmalloc(*n_histogram_entries * sizeof(unsigned long long), GFP_KERNEL); + *histogram_boundaries = kmalloc_array(*n_histogram_entries, + sizeof(unsigned long long), + GFP_KERNEL); if (!*histogram_boundaries) return -ENOMEM; diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index caa51dd351b6..938766794c2e 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -561,7 +561,7 @@ static char **realloc_argv(unsigned *size, char **old_argv) new_size = 8; gfp = GFP_NOIO; } - argv = kmalloc(new_size * sizeof(*argv), gfp); + argv = kmalloc_array(new_size, sizeof(*argv), gfp); if (argv) { memcpy(argv, old_argv, *size * sizeof(*argv)); *size = new_size; diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c index 239c7bb3929b..01c8329b512d 100644 --- a/drivers/md/md-bitmap.c +++ b/drivers/md/md-bitmap.c @@ -789,8 +789,8 @@ static int bitmap_storage_alloc(struct bitmap_storage *store, num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); offset = slot_number * num_pages; - store->filemap = kmalloc(sizeof(struct page *) - * num_pages, GFP_KERNEL); + store->filemap = kmalloc_array(num_pages, sizeof(struct page *), + GFP_KERNEL); if (!store->filemap) return -ENOMEM; diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 0b344d087581..e7c0ecd19234 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -126,8 +126,8 @@ static void * r1buf_pool_alloc(gfp_t gfp_flags, void *data) if (!r1_bio) return NULL; - rps = kmalloc(sizeof(struct resync_pages) * pi->raid_disks, - gfp_flags); + rps = kmalloc_array(pi->raid_disks, sizeof(struct resync_pages), + gfp_flags); if (!rps) goto out_free_r1bio; diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c index 1147ae59e3b6..e35db73b9b9e 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -175,7 +175,7 @@ static void * r10buf_pool_alloc(gfp_t gfp_flags, void *data) nalloc_rp = nalloc; else nalloc_rp = nalloc * 2; - rps = kmalloc(sizeof(struct resync_pages) * nalloc_rp, gfp_flags); + rps = kmalloc_array(nalloc_rp, sizeof(struct resync_pages), gfp_flags); if (!rps) goto out_free_r10bio; -- cgit v1.2.3-59-g8ed1b