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Fix misc Coverity defects in camdd(8)

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CID 1341620	Fix a small memory leak
CID 1341630	Though this is technically a false positive, rearrange the
		code for clarity.
CID 1341635	Eliminate dead code
CID 1368663	Fix a double mutex unlock in the error path

Also:
* Use sig_atomic_t for variables accessed from signal handlers
* Don't conditionalize free(3) on its argument being non-null

Reported by:	Coverity
CID:		1341620 1341630 1341635 1368663
Reviewed by:	ken
MFC after:	4 weeks
Sponsored by:	Spectra Logic Corp
Differential Revision:	https://reviews.freebsd.org/D9237
This commit is contained in:
Alan Somers 2017-01-20 21:40:04 +00:00
parent 77d9b0efa6
commit 5b1696c73f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=312559
1 changed files with 15 additions and 22 deletions
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37
usr.sbin/camdd/camdd.c
View file

@ -420,9 +420,9 @@ struct camdd_dev {
};
static sem_t camdd_sem;
static int need_exit = 0;
static int error_exit = 0;
static int need_status = 0;
static sig_atomic_t need_exit = 0;
static sig_atomic_t error_exit = 0;
static sig_atomic_t need_status = 0;
#ifndef min
#define min(a, b) (a < b) ? a : b
@ -712,11 +712,7 @@ camdd_alloc_buf(struct camdd_dev *dev, camdd_buf_type buf_type)
return (buf);
bailout_error:
if (data_ptr != NULL)
free(data_ptr);
if (buf != NULL)
free(buf);
free(data_ptr);
return (NULL);
}
@ -2262,6 +2258,7 @@ camdd_file_run(struct camdd_dev *dev)
if (file_dev->tmp_buf == NULL) {
buf->status = CAMDD_STATUS_ERROR;
error_count++;
pthread_mutex_lock(&dev->mutex);
goto bailout;
}
for (i = 0, cur_offset = 0; i < data->sg_count; i++) {
@ -2984,7 +2981,6 @@ int
camdd_rw(struct camdd_io_opts *io_opts, int num_io_opts, uint64_t max_io,
int retry_count, int timeout)
{
char *device = NULL;
struct cam_device *new_cam_dev = NULL;
struct camdd_dev *devs[2];
struct timespec start_time;
@ -3004,12 +3000,11 @@ camdd_rw(struct camdd_io_opts *io_opts, int num_io_opts, uint64_t max_io,
for (i = 0; i < num_io_opts; i++) {
switch (io_opts[i].dev_type) {
case CAMDD_DEV_PASS: {
camdd_argmask new_arglist = CAMDD_ARG_NONE;
int bus = 0, target = 0, lun = 0;
char name[30];
int rv;
if (isdigit(io_opts[i].dev_name[0])) {
camdd_argmask new_arglist = CAMDD_ARG_NONE;
int bus = 0, target = 0, lun = 0;
int rv;
/* device specified as bus:target[:lun] */
rv = parse_btl(io_opts[i].dev_name, &bus,
&target, &lun, &new_arglist);
@ -3025,23 +3020,21 @@ camdd_rw(struct camdd_io_opts *io_opts, int num_io_opts, uint64_t max_io,
lun = 0;
new_arglist |= CAMDD_ARG_LUN;
}
new_cam_dev = cam_open_btl(bus, target, lun,
O_RDWR, NULL);
} else {
char name[30];
if (cam_get_device(io_opts[i].dev_name, name,
sizeof name, &unit) == -1) {
warnx("%s", cam_errbuf);
error = 1;
goto bailout;
}
device = strdup(name);
new_arglist |= CAMDD_ARG_DEVICE |CAMDD_ARG_UNIT;
new_cam_dev = cam_open_spec_device(name, unit,
O_RDWR, NULL);
}
if (new_arglist & (CAMDD_ARG_BUS | CAMDD_ARG_TARGET))
new_cam_dev = cam_open_btl(bus, target, lun,
O_RDWR, NULL);
else
new_cam_dev = cam_open_spec_device(device, unit,
O_RDWR, NULL);
if (new_cam_dev == NULL) {
warnx("%s", cam_errbuf);
error = 1;