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From 15345980633c502f0486a2e40e96224f49134130 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Tue, 19 Sep 2023 09:26:35 +0200
Subject: [PATCH] libgomp: Handle NULL environ like pointer to NULL pointer
[PR111413]
clearenv function just sets environ to NULL (after sometimes freeing it),
rather than setting it to a pointer to NULL, and our code was assuming
it is always non-NULL.
Fixed thusly, the change seems to be large but actually is just
+ if (environ)
for (env = environ; *env != 0; env++)
plus reindentation. I've also noticed the block after this for loop
was badly indented (too much) and fixed that too.
No testcase added, as it needs clearenv + dlopen.
2023-09-19 Jakub Jelinek <jakub@redhat.com>
PR libgomp/111413
* env.c (initialize_env): Don't dereference environ if it is NULL.
Reindent.
---
libgomp/env.c | 251 +++++++++++++++++++++++++-------------------------
1 file changed, 126 insertions(+), 125 deletions(-)
diff --git a/libgomp/env.c b/libgomp/env.c
index f24484d7f7074..a21adb3fd4bdb 100644
--- a/libgomp/env.c
+++ b/libgomp/env.c
@@ -2224,139 +2224,140 @@ initialize_env (void)
none = gomp_get_initial_icv_item (GOMP_DEVICE_NUM_FOR_NO_SUFFIX);
initialize_icvs (&none->icvs);
- for (env = environ; *env != 0; env++)
- {
- if (!startswith (*env, "OMP_"))
- continue;
-
- /* Name of the environment variable without suffix "OMP_". */
- char *name = *env + sizeof ("OMP_") - 1;
- for (omp_var = 0; omp_var < OMP_VAR_CNT; omp_var++)
- {
- if (startswith (name, envvars[omp_var].name))
- {
- pos = envvars[omp_var].name_len;
- if (name[pos] == '=')
- {
- pos++;
- flag_var_addr
- = add_initial_icv_to_list (GOMP_DEVICE_NUM_FOR_NO_SUFFIX,
- envvars[omp_var].flag_vars[0],
- params);
- }
- else if (startswith (&name[pos], "_DEV=")
- && envvars[omp_var].flag & GOMP_ENV_SUFFIX_DEV)
- {
- pos += 5;
- flag_var_addr
- = add_initial_icv_to_list (GOMP_DEVICE_NUM_FOR_DEV,
- envvars[omp_var].flag_vars[0],
- params);
- }
- else if (startswith (&name[pos], "_ALL=")
- && envvars[omp_var].flag & GOMP_ENV_SUFFIX_ALL)
- {
- pos += 5;
- flag_var_addr
- = add_initial_icv_to_list (GOMP_DEVICE_NUM_FOR_ALL,
- envvars[omp_var].flag_vars[0],
- params);
- }
- else if (startswith (&name[pos], "_DEV_")
- && envvars[omp_var].flag & GOMP_ENV_SUFFIX_DEV_X)
- {
- pos += 5;
- if (!get_device_num (*env, &name[pos], &dev_num,
- &dev_num_len))
- break;
-
- pos += dev_num_len + 1;
- flag_var_addr
- = add_initial_icv_to_list (dev_num,
- envvars[omp_var].flag_vars[0],
- params);
- }
- else
- {
- gomp_error ("Invalid environment variable in %s", *env);
- break;
- }
- env_val = &name[pos];
+ if (environ)
+ for (env = environ; *env != 0; env++)
+ {
+ if (!startswith (*env, "OMP_"))
+ continue;
- if (envvars[omp_var].parse_func (*env, env_val, params))
- {
- for (i = 0; i < 3; ++i)
- if (envvars[omp_var].flag_vars[i])
- gomp_set_icv_flag (flag_var_addr,
- envvars[omp_var].flag_vars[i]);
- else
+ /* Name of the environment variable without suffix "OMP_". */
+ char *name = *env + sizeof ("OMP_") - 1;
+ for (omp_var = 0; omp_var < OMP_VAR_CNT; omp_var++)
+ {
+ if (startswith (name, envvars[omp_var].name))
+ {
+ pos = envvars[omp_var].name_len;
+ if (name[pos] == '=')
+ {
+ pos++;
+ flag_var_addr
+ = add_initial_icv_to_list (GOMP_DEVICE_NUM_FOR_NO_SUFFIX,
+ envvars[omp_var].flag_vars[0],
+ params);
+ }
+ else if (startswith (&name[pos], "_DEV=")
+ && envvars[omp_var].flag & GOMP_ENV_SUFFIX_DEV)
+ {
+ pos += 5;
+ flag_var_addr
+ = add_initial_icv_to_list (GOMP_DEVICE_NUM_FOR_DEV,
+ envvars[omp_var].flag_vars[0],
+ params);
+ }
+ else if (startswith (&name[pos], "_ALL=")
+ && envvars[omp_var].flag & GOMP_ENV_SUFFIX_ALL)
+ {
+ pos += 5;
+ flag_var_addr
+ = add_initial_icv_to_list (GOMP_DEVICE_NUM_FOR_ALL,
+ envvars[omp_var].flag_vars[0],
+ params);
+ }
+ else if (startswith (&name[pos], "_DEV_")
+ && envvars[omp_var].flag & GOMP_ENV_SUFFIX_DEV_X)
+ {
+ pos += 5;
+ if (!get_device_num (*env, &name[pos], &dev_num,
+ &dev_num_len))
break;
- }
- break;
- }
- }
- }
+ pos += dev_num_len + 1;
+ flag_var_addr
+ = add_initial_icv_to_list (dev_num,
+ envvars[omp_var].flag_vars[0],
+ params);
+ }
+ else
+ {
+ gomp_error ("Invalid environment variable in %s", *env);
+ break;
+ }
+ env_val = &name[pos];
- all = gomp_get_initial_icv_item (GOMP_DEVICE_NUM_FOR_ALL);
- for (omp_var = 0; omp_var < OMP_HOST_VAR_CNT; omp_var++)
- {
- if (none != NULL
- && gomp_get_icv_flag (none->flags, host_envvars[omp_var].flag_var))
- get_icv_member_addr (&none->icvs,
- host_envvars[omp_var].flag_var, params);
- else if (all != NULL
- && gomp_get_icv_flag (all->flags,
- host_envvars[omp_var].flag_var))
- get_icv_member_addr (&all->icvs, host_envvars[omp_var].flag_var,
- params);
- else
- continue;
+ if (envvars[omp_var].parse_func (*env, env_val, params))
+ {
+ for (i = 0; i < 3; ++i)
+ if (envvars[omp_var].flag_vars[i])
+ gomp_set_icv_flag (flag_var_addr,
+ envvars[omp_var].flag_vars[i]);
+ else
+ break;
+ }
- switch (host_envvars[omp_var].type_code)
- {
- case PARSE_INT:
- for (i = 0; i < 3; ++i)
- if (host_envvars[omp_var].dest[i] != NULL && params[i] != NULL)
- *(int *) (host_envvars[omp_var].dest[i]) = *(int *) params[i];
- break;
- case PARSE_BOOL:
- for (i = 0; i < 3; ++i)
- if (host_envvars[omp_var].dest[i] != NULL && params[i] != NULL)
- *(bool *) (host_envvars[omp_var].dest[i]) = *(bool *) params[i];
- break;
- case PARSE_UINT:
- for (i = 0; i < 3; ++i)
- if (host_envvars[omp_var].dest[i] != NULL && params[i] != NULL)
- *(unsigned int *) (host_envvars[omp_var].dest[i])
- = *(unsigned int *) params[i];
- break;
- case PARSE_ULONG:
- for (i = 0; i < 3; ++i)
- if (host_envvars[omp_var].dest[i] != NULL && params[i] != NULL)
- *(unsigned long *) (host_envvars[omp_var].dest[i])
- = *(unsigned long *) params[i];
- break;
- case PARSE_UCHAR:
- for (i = 0; i < 3; ++i)
- if (host_envvars[omp_var].dest[i] != NULL && params[i] != NULL)
- *(unsigned char *) (host_envvars[omp_var].dest[i])
- = *(unsigned char *) params[i];
- break;
- case PARSE_SCHEDULE:
- *(enum gomp_schedule_type *) (host_envvars[omp_var].dest[0])
- = *(enum gomp_schedule_type *) params[0];
- *(int *) (host_envvars[omp_var].dest[1]) = *(int *) params[1];
- break;
- case PARSE_BIND:
- *(char *) (host_envvars[omp_var].dest[0]) = *(char *) params[0];
- *(char **) (host_envvars[omp_var].dest[1]) = *(char **) params[1];
- *(unsigned long *) (host_envvars[omp_var].dest[2])
- = *(unsigned long *) params[2];
- break;
+ break;
+ }
}
}
+ all = gomp_get_initial_icv_item (GOMP_DEVICE_NUM_FOR_ALL);
+ for (omp_var = 0; omp_var < OMP_HOST_VAR_CNT; omp_var++)
+ {
+ if (none != NULL
+ && gomp_get_icv_flag (none->flags, host_envvars[omp_var].flag_var))
+ get_icv_member_addr (&none->icvs,
+ host_envvars[omp_var].flag_var, params);
+ else if (all != NULL
+ && gomp_get_icv_flag (all->flags,
+ host_envvars[omp_var].flag_var))
+ get_icv_member_addr (&all->icvs, host_envvars[omp_var].flag_var,
+ params);
+ else
+ continue;
+
+ switch (host_envvars[omp_var].type_code)
+ {
+ case PARSE_INT:
+ for (i = 0; i < 3; ++i)
+ if (host_envvars[omp_var].dest[i] != NULL && params[i] != NULL)
+ *(int *) (host_envvars[omp_var].dest[i]) = *(int *) params[i];
+ break;
+ case PARSE_BOOL:
+ for (i = 0; i < 3; ++i)
+ if (host_envvars[omp_var].dest[i] != NULL && params[i] != NULL)
+ *(bool *) (host_envvars[omp_var].dest[i]) = *(bool *) params[i];
+ break;
+ case PARSE_UINT:
+ for (i = 0; i < 3; ++i)
+ if (host_envvars[omp_var].dest[i] != NULL && params[i] != NULL)
+ *(unsigned int *) (host_envvars[omp_var].dest[i])
+ = *(unsigned int *) params[i];
+ break;
+ case PARSE_ULONG:
+ for (i = 0; i < 3; ++i)
+ if (host_envvars[omp_var].dest[i] != NULL && params[i] != NULL)
+ *(unsigned long *) (host_envvars[omp_var].dest[i])
+ = *(unsigned long *) params[i];
+ break;
+ case PARSE_UCHAR:
+ for (i = 0; i < 3; ++i)
+ if (host_envvars[omp_var].dest[i] != NULL && params[i] != NULL)
+ *(unsigned char *) (host_envvars[omp_var].dest[i])
+ = *(unsigned char *) params[i];
+ break;
+ case PARSE_SCHEDULE:
+ *(enum gomp_schedule_type *) (host_envvars[omp_var].dest[0])
+ = *(enum gomp_schedule_type *) params[0];
+ *(int *) (host_envvars[omp_var].dest[1]) = *(int *) params[1];
+ break;
+ case PARSE_BIND:
+ *(char *) (host_envvars[omp_var].dest[0]) = *(char *) params[0];
+ *(char **) (host_envvars[omp_var].dest[1]) = *(char **) params[1];
+ *(unsigned long *) (host_envvars[omp_var].dest[2])
+ = *(unsigned long *) params[2];
+ break;
+ }
+ }
+
if (((none != NULL && gomp_get_icv_flag (none->flags, GOMP_ICV_BIND))
|| (all != NULL && gomp_get_icv_flag (all->flags, GOMP_ICV_BIND)))
&& gomp_global_icv.bind_var == omp_proc_bind_false)
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