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usermod: prevent a segv

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in the case where prefix does not exist.

Signed-off-by: Serge Hallyn <shallyn@cisco.com>
This commit is contained in:
Serge Hallyn
2018-05-08 21:37:55 -05:00
parent 73a876a056
commit 48dcf7852e
1 changed files with 3 additions and 1 deletions
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4
libmisc/prefix_flag.c
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@@ -319,6 +319,7 @@ extern struct group *prefix_getgr_nam_gid(const char *grname)
{ {
long long int gid; long long int gid;
char *endptr; char *endptr;
struct group *g;
if (NULL == grname) { if (NULL == grname) {
return NULL; return NULL;
@@ -333,7 +334,8 @@ extern struct group *prefix_getgr_nam_gid(const char *grname)
&& (gid == (gid_t)gid)) { && (gid == (gid_t)gid)) {
return prefix_getgrgid ((gid_t) gid); return prefix_getgrgid ((gid_t) gid);
} }
return __gr_dup(prefix_getgrnam (grname)); g = prefix_getgrnam (grname);
return g ? __gr_dup(g) : NULL;
} }
else else
return getgr_nam_gid(grname); return getgr_nam_gid(grname);