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---
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libmultipath/alias.c | 39 ++++++++++++++++++++++++++++++---------
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1 file changed, 30 insertions(+), 9 deletions(-)
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Index: multipath-tools-130222/libmultipath/alias.c
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===================================================================
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--- multipath-tools-130222.orig/libmultipath/alias.c
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+++ multipath-tools-130222/libmultipath/alias.c
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@@ -46,11 +46,11 @@ format_devname(char *name, int id, int l
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memset(name,0, len);
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strcpy(name, prefix);
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for (pos = len - 1; pos >= prefix_len; pos--) {
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+ id--;
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name[pos] = 'a' + id % 26;
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if (id < 26)
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break;
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id /= 26;
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- id--;
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}
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memmove(name + prefix_len, name + pos, len - pos);
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name[prefix_len + len - pos] = '\0';
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@@ -66,13 +66,22 @@ scan_devname(char *alias, char *prefix)
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if (!prefix || strncmp(alias, prefix, strlen(prefix)))
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return -1;
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+ if (strlen(alias) == strlen(prefix))
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+ return -1;
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+
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+ if (strlen(alias) > strlen(prefix) + 7)
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+ /* id of 'aaaaaaaa' overflows int */
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+ return -1;
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+
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c = alias + strlen(prefix);
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while (*c != '\0' && *c != ' ' && *c != '\t') {
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+ if (*c < 'a' || *c > 'z')
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+ return -1;
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i = *c - 'a';
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n = ( n * 26 ) + i;
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+ if (n < 0)
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+ return -1;
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c++;
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- if (*c < 'a' || *c > 'z')
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- break;
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n++;
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}
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@@ -84,7 +93,9 @@ lookup_binding(FILE *f, char *map_wwid,
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{
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char buf[LINE_MAX];
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unsigned int line_nr = 0;
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- int id = 0;
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+ int id = 1;
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+ int biggest_id = 1;
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+ int smallest_bigger_id = INT_MAX;
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*map_alias = NULL;
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@@ -100,8 +111,12 @@ lookup_binding(FILE *f, char *map_wwid,
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if (!alias) /* blank line */
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continue;
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curr_id = scan_devname(alias, prefix);
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- if (curr_id >= id)
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- id = curr_id + 1;
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+ if (curr_id == id)
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+ id++;
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+ if (curr_id > biggest_id)
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+ biggest_id = curr_id;
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+ if (curr_id > id && curr_id < smallest_bigger_id)
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+ smallest_bigger_id = curr_id;
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wwid = strtok(NULL, " \t");
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if (!wwid){
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condlog(3,
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@@ -116,11 +131,17 @@ lookup_binding(FILE *f, char *map_wwid,
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if (*map_alias == NULL)
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condlog(0, "Cannot copy alias from bindings "
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"file : %s", strerror(errno));
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- return id;
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+ return 0;
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}
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}
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condlog(3, "No matching wwid [%s] in bindings file.", map_wwid);
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- return id;
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+ if (id < 0) {
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+ condlog(0, "no more available user_friendly_names");
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+ return 0;
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+ }
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+ if (id < smallest_bigger_id)
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+ return id;
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+ return biggest_id + 1;
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}
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static int
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@@ -254,7 +275,7 @@ get_user_friendly_alias(char *wwid, char
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return NULL;
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}
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- if (!alias && can_write && !bindings_read_only)
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+ if (!alias && can_write && !bindings_read_only && id)
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alias = allocate_binding(fd, wwid, id, prefix);
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fclose(f);
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