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nss-systemd: fix required buffer size calculation

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This also fixes the pointer assigned to the gr_mem element of struct group.

Fixes a bug introduced by 47fd7fa6c6.

Fixes #21935.
This commit is contained in:
Yu Watanabe 2021-12-31 00:31:51 +09:00
parent b78d7f2468
commit 1e65eb8f9b
1 changed files with 2 additions and 2 deletions
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4
src/nss-systemd/nss-systemd.c
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@ -236,7 +236,7 @@ static enum nss_status copy_synthesized_group(
required = strlen(src->gr_name) + 1;
required += strlen(src->gr_passwd) + 1;
required += 1; /* ...but that NULL still needs to be stored into the buffer! */
required += sizeof(char*); /* ...but that NULL still needs to be stored into the buffer! */
if (buflen < required) {
*errnop = ERANGE;
@ -250,7 +250,7 @@ static enum nss_status copy_synthesized_group(
/* String fields point into the user-provided buffer */
dest->gr_name = buffer;
dest->gr_passwd = stpcpy(dest->gr_name, src->gr_name) + 1;
dest->gr_mem = (char **) strcpy(dest->gr_passwd, src->gr_passwd) + 1;
dest->gr_mem = (char **) stpcpy(dest->gr_passwd, src->gr_passwd) + 1;
*dest->gr_mem = NULL;
return NSS_STATUS_SUCCESS;