Search Linux Wireless

Re: [PATCH 03/12] net: ipa: Proactively round up to kmalloc bucket size

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 9/21/22 10:10 PM, Kees Cook wrote:
Instead of discovering the kmalloc bucket size _after_ allocation, round
up proactively so the allocation is explicitly made for the full size,
allowing the compiler to correctly reason about the resulting size of
the buffer through the existing __alloc_size() hint.

Cc: Alex Elder <elder@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
Cc: Paolo Abeni <pabeni@xxxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
  drivers/net/ipa/gsi_trans.c | 7 +++++--
  1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ipa/gsi_trans.c b/drivers/net/ipa/gsi_trans.c
index 18e7e8c405be..cec968854dcf 100644
--- a/drivers/net/ipa/gsi_trans.c
+++ b/drivers/net/ipa/gsi_trans.c
@@ -89,6 +89,7 @@ int gsi_trans_pool_init(struct gsi_trans_pool *pool, size_t size, u32 count,
  			u32 max_alloc)
  {
  	void *virt;
+	size_t allocate;

I don't care about this but the reverse Christmas tree
convention would put the "allocate" variable definition
above "virt".

Whether you fix that or not, this patch looks good to me.

Reviewed-by: Alex Elder <elder@xxxxxxxxxx>

  	if (!size)
  		return -EINVAL;
@@ -104,13 +105,15 @@ int gsi_trans_pool_init(struct gsi_trans_pool *pool, size_t size, u32 count,
  	 * If there aren't enough entries starting at the free index,
  	 * we just allocate free entries from the beginning of the pool.
  	 */
-	virt = kcalloc(count + max_alloc - 1, size, GFP_KERNEL);
+	allocate = size_mul(count + max_alloc - 1, size);
+	allocate = kmalloc_size_roundup(allocate);
+	virt = kzalloc(allocate, GFP_KERNEL);
  	if (!virt)
  		return -ENOMEM;
pool->base = virt;
  	/* If the allocator gave us any extra memory, use it */
-	pool->count = ksize(pool->base) / size;
+	pool->count = allocate / size;
  	pool->free = 0;
  	pool->max_alloc = max_alloc;
  	pool->size = size;




[Index of Archives]     [Linux Host AP]     [ATH6KL]     [Linux Wireless Personal Area Network]     [Linux Bluetooth]     [Wireless Regulations]     [Linux Netdev]     [Kernel Newbies]     [Linux Kernel]     [IDE]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite Hiking]     [MIPS Linux]     [ARM Linux]     [Linux RAID]

  Powered by Linux