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-rw-r--r--procps/sysctl.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/procps/sysctl.c b/procps/sysctl.c
index 90e47ea9a..0876a73de 100644
--- a/procps/sysctl.c
+++ b/procps/sysctl.c
@@ -234,19 +234,30 @@ static int sysctl_display_all(const char *path)
static void sysctl_dots_to_slashes(char *name)
{
- char *cptr = name;
+ char *cptr, *last_good;
+ char *end = name + strlen(name) - 1;
/* Example from bug 3894:
* net.ipv4.conf.eth0.100.mc_forwarding ->
- * net/ipv4/conf/eth0.100/mc_forwarding */
- while (*cptr != '\0') {
+ * net/ipv4/conf/eth0.100/mc_forwarding. NB:
+ * net/ipv4/conf/eth0/mc_forwarding *also exists*,
+ * therefore we must start from the end, and if
+ * we replaced even one . -> /, start over again,
+ * but never replace dots before the position
+ * where replacement occurred. */
+ last_good = name - 1;
+ again:
+ cptr = end;
+ while (cptr > last_good) {
if (*cptr == '.') {
*cptr = '\0';
- if (access(name, F_OK) == 0)
+ if (access(name, F_OK) == 0) {
*cptr = '/';
- else
- *cptr = '.';
+ last_good = cptr;
+ goto again;
+ }
+ *cptr = '.';
}
- cptr++;
+ cptr--;
}
} /* end sysctl_dots_to_slashes() */