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authorMichael Forney <mforney@mforney.org>2013-10-26 01:12:51 +0000
committerMichael Forney <mforney@mforney.org>2013-10-25 18:53:47 -0700
commitb49b09e046df217335dca68bc787b6b9d10bce44 (patch)
treee4e8ae698bacca5660119fa3b0e42744f6ba9a78
parent630497dbc07971f6edc5b0cab4651ceef2ec662e (diff)
libudev-util.c: Handle -1 return from sysconf(_SC_GET{PW,GR}_R_SIZE_MAX)
POSIX says: Note that sysconf(_SC_GETGR_R_SIZE_MAX) may return -1 if there is no hard limit on the size of the buffer needed to store all the groups returned. The example from POSIX uses a default buffer size of 1024 in that case. Signed-off-by: Michael Forney <mforney@mforney.org>
-rw-r--r--src/libudev/libudev-util.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/libudev/libudev-util.c b/src/libudev/libudev-util.c
index 337514a13d..ae5e285ec0 100644
--- a/src/libudev/libudev-util.c
+++ b/src/libudev/libudev-util.c
@@ -84,8 +84,11 @@ uid_t util_lookup_user(struct udev *udev, const char *user)
struct passwd *pw;
uid_t uid;
size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
- char *buf = alloca(buflen);
+ char *buf;
+ if (buflen == -1)
+ buflen = 1024;
+ buf = alloca(buflen);
if (streq(user, "root"))
return 0;
uid = strtoul(user, &endptr, 10);
@@ -111,6 +114,8 @@ gid_t util_lookup_group(struct udev *udev, const char *group)
size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
char *buf = NULL;
+ if (buflen == -1)
+ buflen = 1024;
if (streq(group, "root"))
return 0;
gid = strtoul(group, &endptr, 10);