[lvm-devel] master - cleanup: use NAME_LEN buffer instead of alloca
Zdenek Kabelac
zkabelac at fedoraproject.org
Mon Nov 9 09:28:53 UTC 2015
Gitweb: http://git.fedorahosted.org/git/?p=lvm2.git;a=commitdiff;h=5c48ef993b372397716dc6f1cf81aec5b5ef2188
Commit: 5c48ef993b372397716dc6f1cf81aec5b5ef2188
Parent: 2e04eee19213b3f498a4e8209cdcc14fcb7a0517
Author: Zdenek Kabelac <zkabelac at redhat.com>
AuthorDate: Thu Nov 5 18:32:47 2015 +0100
Committer: Zdenek Kabelac <zkabelac at redhat.com>
CommitterDate: Mon Nov 9 10:22:51 2015 +0100
cleanup: use NAME_LEN buffer instead of alloca
Drop alloca and use NAME_LEN size to get implicit check
for max len of LV name.
---
tools/lvconvert.c | 22 +++++++++-------------
1 files changed, 9 insertions(+), 13 deletions(-)
diff --git a/tools/lvconvert.c b/tools/lvconvert.c
index c6cea0d..9fc064b 100644
--- a/tools/lvconvert.c
+++ b/tools/lvconvert.c
@@ -805,36 +805,32 @@ int lvconvert_poll(struct cmd_context *cmd, struct logical_volume *lv,
static int _insert_lvconvert_layer(struct cmd_context *cmd,
struct logical_volume *lv)
{
- char *format, *layer_name;
- size_t len;
+ char format[NAME_LEN], layer_name[NAME_LEN];
int i;
/*
- * We would like to give the same number for this layer
- * and the newly added mimage.
- * However, LV name of newly added mimage is determined *after*
+ * We would like to give the same number for this layer
+ * and the newly added mimage.
+ * However, LV name of newly added mimage is determined *after*
* the LV name of this layer is determined.
*
* So, use generate_lv_name() to generate mimage name first
* and take the number from it.
*/
- len = strlen(lv->name) + 32;
- if (!(format = alloca(len)) ||
- !(layer_name = alloca(len)) ||
- dm_snprintf(format, len, "%s_mimage_%%d", lv->name) < 0) {
- log_error("lvconvert: layer name allocation failed.");
+ if (dm_snprintf(format, sizeof(format), "%s_mimage_%%d", lv->name) < 0) {
+ log_error("lvconvert: layer name creation failed.");
return 0;
}
- if (!generate_lv_name(lv->vg, format, layer_name, len) ||
+ if (!generate_lv_name(lv->vg, format, layer_name, sizeof(layer_name)) ||
sscanf(layer_name, format, &i) != 1) {
log_error("lvconvert: layer name generation failed.");
return 0;
}
- if (dm_snprintf(layer_name, len, MIRROR_SYNC_LAYER "_%d", i) < 0) {
- log_error("layer name allocation failed.");
+ if (dm_snprintf(layer_name, sizeof(layer_name), MIRROR_SYNC_LAYER "_%d", i) < 0) {
+ log_error("layer name creation failed.");
return 0;
}
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