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authorLen Baker <len.baker@gmx.com>2021-09-19 11:45:39 +0200
committerGustavo A. R. Silva <gustavoars@kernel.org>2021-10-20 18:24:31 -0500
commit6446c4fb12ecc130ed9b4333372426b305a35e2b (patch)
tree9c41c2baaf0b7980a74c8cdd09e1a5507701eddb /fs/aio.c
parent98b160c828f312955daa94713a5fca595400b8c3 (diff)
aio: Prefer struct_size over open coded arithmetic
As noted in the "Deprecated Interfaces, Language Features, Attributes, and Conventions" documentation [1], size calculations (especially multiplication) should not be performed in memory allocator (or similar) function arguments due to the risk of them overflowing. This could lead to values wrapping around and a smaller allocation being made than the caller was expecting. Using those allocations could lead to linear overflows of heap memory and other misbehaviors. So, use the struct_size() helper to do the arithmetic instead of the argument "size + size * count" in the kzalloc() function. [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments Signed-off-by: Len Baker <len.baker@gmx.com> Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Diffstat (limited to 'fs/aio.c')
-rw-r--r--fs/aio.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/aio.c b/fs/aio.c
index 51b08ab01dff..c2978c0b872c 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -659,8 +659,7 @@ static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm)
new_nr = (table ? table->nr : 1) * 4;
spin_unlock(&mm->ioctx_lock);
- table = kzalloc(sizeof(*table) + sizeof(struct kioctx *) *
- new_nr, GFP_KERNEL);
+ table = kzalloc(struct_size(table, table, new_nr), GFP_KERNEL);
if (!table)
return -ENOMEM;