libglusterfs: Don't allow '-0' as input value for numbers

Problem:
io-stats tries to init log-buf-size as uint32. All gf_string2u*** functions
which get the unsigned values from string don't want the string to contain '-'.
So the GF_OPTION_INIT with '-0' as value fails init in io-stats, but by that
time 'ret' is already reset to 0. Io-stats ends up returning 0 even when init
failed. Because of this caller of init thinks initialization is successful when
it is not. iostat_xlator->private is still NULL.  Because of this when a fop
tries to access members of io-stat-private structure, it crashes.

Fix:
I initially thought may be we should fix all gf_string2u*** functions to
accept '-0'. But all these functions are used only for setting volume options.
If we accept '-0', gluster volume info shows output as follows:

diagnostics.brick-log-buf-size: -0

This seemed ugly, so I felt it is better to disallow '-0' as valid input for
numbers.

Also fixed return value in cases of failures in io-stats.

Change-Id: I67ac92853b6d2be70516ad1d07505ffd9f058aa4
BUG: 1111557
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/8129
Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Harshavardhana <harsha@harshavardhana.net>
Tested-by: Harshavardhana <harsha@harshavardhana.net>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/libglusterfs/src/options.c b/libglusterfs/src/options.c
index f63c60476da..9edb7c03df2 100644
--- a/libglusterfs/src/options.c
+++ b/libglusterfs/src/options.c
@@ -58,6 +58,7 @@ xlator_option_validate_int (xlator_t *xl, const char *key, const char *value,
                             volume_option_t *opt, char **op_errstr)
 {
         long long inputll = 0;
+        unsigned long long uinputll = 0;
         int       ret = -1;
         char      errstr[256];
 
@@ -70,6 +71,15 @@ xlator_option_validate_int (xlator_t *xl, const char *key, const char *value,
                 goto out;
         }
 
+        /* Handle '-0' */
+        if ((inputll == 0) && (gf_string2ulonglong (value, &uinputll) != 0)) {
+                snprintf (errstr, 256,
+                          "invalid number format \"%s\" in option \"%s\"",
+                          value, key);
+                gf_log (xl->name, GF_LOG_ERROR, "%s", errstr);
+                goto out;
+        }
+
         if ((opt->min == 0) && (opt->max == 0) &&
             (opt->validate == GF_OPT_VALIDATE_BOTH)) {
                 gf_log (xl->name, GF_LOG_TRACE,