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free/NULL out variables prior to calling strdup to avoid leaking memory

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if arguments are specified more than once with "camcontrol timestamp".

CID:		1366829, 1366831
MFC after:	1 week
This commit is contained in:
Enji Cooper 2016-12-10 23:26:34 +00:00
parent 14a8d2f995
commit 110559ba69
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=309839
1 changed files with 10 additions and 0 deletions
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10
sbin/camcontrol/timestamp.c
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@ -336,6 +336,11 @@ timestamp(struct cam_device *device, int argc, char **argv, char *combinedopt,
int single_arg = 0;
int do_utc = 0;
#define FREE(x) do { \
free(x); \
x = NULL; \
} while(0)
while ((c = getopt(argc, argv, combinedopt)) != -1) {
switch (c) {
case 'r': {
@ -358,6 +363,7 @@ timestamp(struct cam_device *device, int argc, char **argv, char *combinedopt,
}
case 'f': {
single_arg++;
FREE(format_string);
format_string = strdup(optarg);
if (format_string == NULL) {
warn("Error allocating memory for format "
@ -369,6 +375,7 @@ timestamp(struct cam_device *device, int argc, char **argv, char *combinedopt,
}
case 'm': {
single_arg++;
FREE(format_string);
format_string = strdup(MIL);
if (format_string == NULL) {
warn("Error allocating memory");
@ -382,6 +389,7 @@ timestamp(struct cam_device *device, int argc, char **argv, char *combinedopt,
break;
}
case 'T':
FREE(timestamp_string);
timestamp_string = strdup(optarg);
if (timestamp_string == NULL) {
warn("Error allocating memory for format "
@ -395,6 +403,8 @@ timestamp(struct cam_device *device, int argc, char **argv, char *combinedopt,
}
}
#undef FREE
if (action == -1) {
warnx("Must specify an action, either -r or -s");
error = 1;