AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

libceph: fix undefined behavior when using snprintf()

Browse Source 
The variable "str" is used as both the source and destination in
function snprintf(), which is undefined behavior based on C11. The
original description in C11 is:
	"If copying takes place between objects that
	overlap, the behavior is undefined."

And, the function of ceph_osdmap_state_str() is to return the osdmap
state, so it should return "doesn't exist" when all the conditions
are not satisfied. I fix it in this patch.

[elder@inktank.com: shortened the commit message]

Signed-off-by: Cong Ding <dinggnu@gmail.com>
Reviewed-by: Alex Elder <elder@inktank.com>
This commit is contained in:
Cong Ding 2013-01-25 17:48:59 -06:00 committed by Alex Elder
parent c04306471a
commit 1ec3911dbd
1 changed files with 9 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
net/ceph/osdmap.c
View File

@ -13,26 +13,18 @@
char *ceph_osdmap_state_str(char *str, int len, int state)
{
int flag = 0;
if (!len)
goto done;
return str;
*str = '\0';
if (state) {
if (state & CEPH_OSD_EXISTS) {
snprintf(str, len, "exists");
flag = 1;
}
if (state & CEPH_OSD_UP) {
snprintf(str, len, "%s%s%s", str, (flag ? ", " : ""),
"up");
flag = 1;
}
} else {
if ((state & CEPH_OSD_EXISTS) && (state & CEPH_OSD_UP))
snprintf(str, len, "exists, up");
else if (state & CEPH_OSD_EXISTS)
snprintf(str, len, "exists");
else if (state & CEPH_OSD_UP)
snprintf(str, len, "up");
else
snprintf(str, len, "doesn't exist");
}
done:
return str;
}