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qemu-nbd: Avoid strtol open-coding 

Our copy-and-pasted open-coding of strtol handling forgot to
handle overflow conditions.  Use qemu_strto*() instead.

In the case of --partition, since we insist on a user-supplied
partition to be non-zero, we can use 0 rather than -1 for our
initial value to distinguish when a partition is not being
served, for slightly more optimal code.

The error messages for out-of-bounds values are less specific,
but should not be a terrible loss in quality.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Richard W.M. Jones <rjones@redhat.com>
Message-Id: <20190117193658.16413-8-eblake@redhat.com>
This commit is contained in:
Eric Blake 2019-01-17 13:36:44 -06:00
parent 9d26dfcbab
commit 43b510113b
1 changed files with 9 additions and 19 deletions
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28
qemu-nbd.c
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@ -546,9 +546,8 @@ int main(int argc, char **argv)
};
int ch;
int opt_ind = 0;
char *end;
int flags = BDRV_O_RDWR;
int partition = -1;
int partition = 0;
int ret = 0;
bool seen_cache = false;
bool seen_discard = false;
@ -660,9 +659,8 @@ int main(int argc, char **argv)
port = optarg;
break;
case 'o':
dev_offset = strtoll (optarg, &end, 0);
if (*end) {
error_report("Invalid offset `%s'", optarg);
if (qemu_strtou64(optarg, NULL, 0, &dev_offset) < 0) {
error_report("Invalid offset '%s'", optarg);
exit(EXIT_FAILURE);
}
break;
@ -684,13 +682,9 @@ int main(int argc, char **argv)
flags &= ~BDRV_O_RDWR;
break;
case 'P':
partition = strtol(optarg, &end, 0);
if (*end) {
error_report("Invalid partition `%s'", optarg);
exit(EXIT_FAILURE);
}
if (partition < 1 || partition > 8) {
error_report("Invalid partition %d", partition);
if (qemu_strtoi(optarg, NULL, 0, &partition) < 0 ||
partition < 1 || partition > 8) {
error_report("Invalid partition '%s'", optarg);
exit(EXIT_FAILURE);
}
break;
@ -711,15 +705,11 @@ int main(int argc, char **argv)
device = optarg;
break;
case 'e':
shared = strtol(optarg, &end, 0);
if (*end) {
if (qemu_strtoi(optarg, NULL, 0, &shared) < 0 ||
shared < 1) {
error_report("Invalid shared device number '%s'", optarg);
exit(EXIT_FAILURE);
}
if (shared < 1) {
error_report("Shared device number must be greater than 0");
exit(EXIT_FAILURE);
}
break;
case 'f':
fmt = optarg;
@ -1007,7 +997,7 @@ int main(int argc, char **argv)
}
fd_size -= dev_offset;
if (partition != -1) {
if (partition) {
uint64_t limit;
if (dev_offset) {