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authorPaul Eggert <eggert@cs.ucla.edu>2015-03-12 15:57:07 -0700
committerPaul Eggert <eggert@cs.ucla.edu>2015-03-13 10:14:03 -0700
commit2ecccaede9097f867284d352a881d8f226ba4fb7 (patch)
tree3b108e62b75c4c596a309b4697fde584d39b91f4 /stdlib
parentcdaf79d0af439ade496a1f6235f503e491502cd6 (diff)
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* stdlib/setenv.c (__add_to_environ):
Dump core quickly if setenv (..., NULL, ...) is called.
Diffstat (limited to 'stdlib')
-rw-r--r--stdlib/setenv.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/stdlib/setenv.c b/stdlib/setenv.c
index b60c4f0..0534236 100644
--- a/stdlib/setenv.c
+++ b/stdlib/setenv.c
@@ -114,8 +114,16 @@ __add_to_environ (name, value, combined, replace)
{
char **ep;
size_t size;
+
+ /* Compute lengths before locking, so that the critical section is
+ less of a performance bottleneck. VALLEN is needed only if
+ COMBINED is non-null. Also, testing COMBINED instead of VALUE
+ causes setenv (..., NULL, ...) to dump core now instead of
+ corrupting memory later. */
const size_t namelen = strlen (name);
- const size_t vallen = value != NULL ? strlen (value) + 1 : 0;
+ size_t vallen;
+ if (combined != NULL)
+ vallen = strlen (value) + 1;
LOCK;