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mm: fix leak in fail path

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If the dm_realloc would fail, the already allocate _maps_buffer
memory would have been lost (overwritten with NULL).
Fix this by using temporary line buffer.

Also add a minor cleanup to set end of buffer to '\0',
only when we really know the file size fits the preallocated buffer.
This commit is contained in:
Zdenek Kabelac 2013-05-13 12:59:38 +02:00
parent e926f22457
commit 55fe07ad98
2 changed files with 12 additions and 8 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.99 -
===================================
Fix memory resource leak in memlocking error path.
Fix premature DM version checking which caused useless mapper/control access.
Add "active" LV reporting field to show activation state.
Add "monitor" segment reporting field to show dmevent monitoring status.

17
lib/mm/memlock.c
View File

@ -270,24 +270,27 @@ static int _memlock_maps(struct cmd_context *cmd, lvmlock_t lock, size_t *mstats
if (!_maps_buffer || len >= _maps_len) {
if (_maps_buffer)
_maps_len *= 2;
if (!(_maps_buffer = dm_realloc(_maps_buffer, _maps_len))) {
log_error("Allocation of maps buffer failed");
if (!(line = dm_realloc(_maps_buffer, _maps_len))) {
log_error("Allocation of maps buffer failed.");
return 0;
}
_maps_buffer = line;
}
if (lseek(_maps_fd, 0, SEEK_SET))
log_sys_error("lseek", _procselfmaps);
for (len = 0 ; len < _maps_len; len += n) {
if (!(n = read(_maps_fd, _maps_buffer + len, _maps_len - len))) {
_maps_buffer[len] = '\0';
if (!(n = read(_maps_fd, _maps_buffer + len, _maps_len - len)))
break; /* EOF */
if (n == -1) {
log_sys_error("read", _procselfmaps);
return 0;
}
if (n == -1)
return_0;
}
if (len < _maps_len) /* fits in buffer */
if (len < _maps_len) { /* fits in buffer */
_maps_buffer[len] = '\0';
break;
}
}
line = _maps_buffer;
cn = find_config_tree_node(cmd, activation_mlock_filter_CFG);