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authorEric Blake <eblake@redhat.com>2019-01-17 13:36:44 -0600
committerEric Blake <eblake@redhat.com>2019-01-21 15:49:51 -0600
commit43b510113bb2c6393c98a31dae9b57022a9c5636 (patch)
tree652a6194aae4111fc432159691cfc315fb0acbbc /qemu-nbd.c
parent9d26dfcbab62746b3e66ec7784d75c13ff499669 (diff)
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>
Diffstat (limited to 'qemu-nbd.c')
-rw-r--r--qemu-nbd.c28
1 files changed, 9 insertions, 19 deletions
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 598caa656b..efca0e44a9 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -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) {