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autofs-5.1.8 - fix sysconf(3) return handling
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From: Fabian Groffen <grobian@gentoo.org>
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The sysconf(3) return handling doesn't handle a -1 return with errno
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not changed which indicated a maximum or minimum limit that's not
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known.
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Add handling of this case.
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Signed-off-by: Fabian Groffen <grobian@gentoo.org>
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Signed-off-by: Ian Kent <raven@themaw.net>
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---
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CHANGELOG | 1 +
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lib/mounts.c | 13 +++++++++++--
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2 files changed, 12 insertions(+), 2 deletions(-)
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--- autofs-5.1.4.orig/CHANGELOG
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+++ autofs-5.1.4/CHANGELOG
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@@ -91,6 +91,7 @@
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- fix use after free in tree_mapent_delete_offset_tree().
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- fix memory leak in xdr_exports().
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- avoid calling pthread_getspecific() with NULL key_thread_attempt_id.
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+- fix sysconf(3) return handling.
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xx/xx/2018 autofs-5.1.5
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- fix flag file permission.
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--- autofs-5.1.4.orig/lib/mounts.c
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+++ autofs-5.1.4/lib/mounts.c
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@@ -2385,11 +2385,17 @@ void set_tsd_user_vars(unsigned int logo
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/* Try to get passwd info */
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+ /* sysconf may return -1 with unchanged errno to indicate unlimited
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+ * size, same for the call for _SC_GETGR_R_SIZE_MAX below
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+ */
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+ errno = 0;
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tmplen = sysconf(_SC_GETPW_R_SIZE_MAX);
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- if (tmplen < 0) {
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+ if (tmplen < 0 && errno != 0) {
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error(logopt, "failed to get buffer size for getpwuid_r");
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goto free_tsv;
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}
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+ if (tmplen < 0)
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+ tmplen = 1024; /* assume something reasonable */
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pw_tmp = malloc(tmplen + 1);
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if (!pw_tmp) {
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@@ -2422,11 +2428,14 @@ void set_tsd_user_vars(unsigned int logo
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/* Try to get group info */
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+ errno = 0;
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grplen = sysconf(_SC_GETGR_R_SIZE_MAX);
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- if (grplen < 0) {
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+ if (grplen < 0 && errno != 0) {
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error(logopt, "failed to get buffer size for getgrgid_r");
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goto free_tsv_home;
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}
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+ if (grplen < 0)
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+ grplen = 1024;
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gr_tmp = NULL;
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status = ERANGE;
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