| Message ID | 20190403164611.GA29107@embeddedor (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 0cf83903aad03dc7f444a47990def48c4a9d3276 |
| Delegated to: | Kalle Valo |
| Headers | show |
| Series | [next] brcmfmac: Use struct_size() in kzalloc() | expand |
"Gustavo A. R. Silva" <gustavo@embeddedor.com> wrote: > One of the more common cases of allocation size calculations is finding > the size of a structure that has a zero-sized array at the end, along > with memory for some number of elements for that array. For example: > > struct foo { > int stuff; > struct boo entry[]; > }; > > size = sizeof(struct foo) + count * sizeof(struct boo); > instance = kzalloc(size, GFP_KERNEL) > > Instead of leaving these open-coded and prone to type mistakes, we can > now use the new struct_size() helper: > > instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL) > > Notice that, in this case, variable reqsz is not necessary, > hence it is removed. > > This code was detected with the help of Coccinelle. > > Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Patch applied to wireless-drivers-next.git, thanks. 0cf83903aad0 brcmfmac: Use struct_size() in kzalloc()
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c index 8209a42dea72..07b3ba949da5 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c @@ -711,7 +711,6 @@ brcmf_fw_alloc_request(u32 chip, u32 chiprev, size_t mp_path_len; u32 i, j; char end = '\0'; - size_t reqsz; for (i = 0; i < table_size; i++) { if (mapping_table[i].chipid == chip && @@ -726,8 +725,7 @@ brcmf_fw_alloc_request(u32 chip, u32 chiprev, return NULL; } - reqsz = sizeof(*fwreq) + n_fwnames * sizeof(struct brcmf_fw_item); - fwreq = kzalloc(reqsz, GFP_KERNEL); + fwreq = kzalloc(struct_size(fwreq, items, n_fwnames), GFP_KERNEL); if (!fwreq) return NULL;
One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; struct boo entry[]; }; size = sizeof(struct foo) + count * sizeof(struct boo); instance = kzalloc(size, GFP_KERNEL) Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL) Notice that, in this case, variable reqsz is not necessary, hence it is removed. This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> --- drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)