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authorMartin Pitt <martin.pitt@ubuntu.com>2015-06-01 11:32:39 +0200
committerMartin Pitt <martin.pitt@ubuntu.com>2015-06-01 12:04:37 +0200
commitd854ba50a82f28b776c670d27156f0e9881fde8a (patch)
tree9d33921ac92399c15fc79feb43899eeb21bd7082 /src
parent19672f1e5fd23ec3ea5b93b8268ae07f2b8e9645 (diff)
sd-device: fix invalid property strv pointers
In device_update_properties_bufs(), the strv is built from pointers into the single nul-terminated buf_nulstr string, to avoid allocating the key=value strings twice. However, we must not do that while building and GREEDY_REALLOC0()'ing buf_nulstr, as each time when this actually reallocates memory the pointers we wrote into buf_strv so far become invalid. So change the logic to first completely build the new buf_nulstr, and then iterate over it to pick out the pointers to the individual key=value strings for properties_strv. This fixes invalid environment for udev callouts.
Diffstat (limited to 'src')
-rw-r--r--src/libsystemd/sd-device/device-private.c23
1 files changed, 13 insertions, 10 deletions
diff --git a/src/libsystemd/sd-device/device-private.c b/src/libsystemd/sd-device/device-private.c
index 10370af029..deb8efd05d 100644
--- a/src/libsystemd/sd-device/device-private.c
+++ b/src/libsystemd/sd-device/device-private.c
@@ -636,10 +636,9 @@ int device_new_from_nulstr(sd_device **ret, uint8_t *nulstr, size_t len) {
static int device_update_properties_bufs(sd_device *device) {
const char *val, *prop;
- char **buf_strv = NULL;
uint8_t *buf_nulstr = NULL;
- size_t allocated_nulstr = 0, allocated_strv = 0;
- size_t nulstr_len = 0, strv_size = 0;
+ size_t allocated_nulstr = 0;
+ size_t nulstr_len = 0, num = 0, i;
assert(device);
@@ -655,20 +654,24 @@ static int device_update_properties_bufs(sd_device *device) {
if (!buf_nulstr)
return -ENOMEM;
- buf_strv = GREEDY_REALLOC0(buf_strv, allocated_strv, strv_size + 2);
- if (!buf_strv)
- return -ENOMEM;
-
- buf_strv[strv_size ++] = (char *)&buf_nulstr[nulstr_len];
strscpyl((char *)buf_nulstr + nulstr_len, len + 1, prop, "=", val, NULL);
nulstr_len += len + 1;
+ ++num;
}
free(device->properties_nulstr);
- free(device->properties_strv);
device->properties_nulstr = buf_nulstr;
device->properties_nulstr_len = nulstr_len;
- device->properties_strv = buf_strv;
+
+ /* build strv from buf_nulstr */
+ free(device->properties_strv);
+ device->properties_strv = new0(char *, num + 1);
+ i = 0;
+ NULSTR_FOREACH(val, (char*) buf_nulstr) {
+ device->properties_strv[i] = (char *) val;
+ assert(i < num);
+ i++;
+ }
device->properties_buf_outdated = false;