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mmc: core: block: fix sloppy typing in mmc_blk_ioctl_multi_cmd()

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Despite mmc_ioc_multi_cmd::num_of_cmds is a 64-bit field, its maximum
value is limited to MMC_IOC_MAX_CMDS (only 255); using a 64-bit local
variable to hold a copy of that field leads to gcc generating ineffective
loop code: despite the source code using an *int* variable for the loop
counters,  the 32-bit object code uses 64-bit unsigned counters.  Also,
gcc has to drop the most significant word of that 64-bit variable when
calling kcalloc() and assigning to mmc_queue_req::ioc_count anyway.
Using the *unsigned int* variable instead results in a better code.

Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.

Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/eea3b0bd-6091-f005-7189-b5b7868abdb6@omp.ru
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Sergey Shtylyov 2022-03-31 00:09:07 +03:00 committed by Ulf Hansson
parent 7792fdf626
commit 103da0667d
1 changed files with 9 additions and 7 deletions
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16
drivers/mmc/core/block.c
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@ -676,8 +676,9 @@ static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
struct mmc_ioc_cmd __user *cmds = user->cmds;
struct mmc_card *card;
struct mmc_queue *mq;
int i, err = 0, ioc_err = 0;
int err = 0, ioc_err = 0;
__u64 num_of_cmds;
unsigned int i, n;
struct request *req;
if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
@ -690,15 +691,16 @@ static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
if (num_of_cmds > MMC_IOC_MAX_CMDS)
return -EINVAL;
idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
n = num_of_cmds;
idata = kcalloc(n, sizeof(*idata), GFP_KERNEL);
if (!idata)
return -ENOMEM;
for (i = 0; i < num_of_cmds; i++) {
for (i = 0; i < n; i++) {
idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
if (IS_ERR(idata[i])) {
err = PTR_ERR(idata[i]);
num_of_cmds = i;
n = i;
goto cmd_err;
}
/* This will be NULL on non-RPMB ioctl():s */
@ -725,18 +727,18 @@ static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
req_to_mmc_queue_req(req)->drv_op =
rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
req_to_mmc_queue_req(req)->drv_op_data = idata;
req_to_mmc_queue_req(req)->ioc_count = num_of_cmds;
req_to_mmc_queue_req(req)->ioc_count = n;
blk_execute_rq(req, false);
ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
/* copy to user if data and response */
for (i = 0; i < num_of_cmds && !err; i++)
for (i = 0; i < n && !err; i++)
err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
blk_mq_free_request(req);
cmd_err:
for (i = 0; i < num_of_cmds; i++) {
for (i = 0; i < n; i++) {
kfree(idata[i]->buf);
kfree(idata[i]);
}