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authorEric Biggers <ebiggers3@gmail.com>2017-12-08 15:13:28 +0000
committerDavid Howells <dhowells@redhat.com>2017-12-08 15:13:28 +0000
commit8dfd2f22d3bf3ab7714f7495ad5d897b8845e8c1 (patch)
treec937db5e51b0f6404d53cb4044e83b8071a8cc51 /lib
parent47e0a208fb9d91e3f3c86309e752b13a36470ae8 (diff)
download96b-common-8dfd2f22d3bf3ab7714f7495ad5d897b8845e8c1.tar.gz
509: fix printing uninitialized stack memory when OID is empty
Callers of sprint_oid() do not check its return value before printing the result. In the case where the OID is zero-length, -EBADMSG was being returned without anything being written to the buffer, resulting in uninitialized stack memory being printed. Fix this by writing "(bad)" to the buffer in the cases where -EBADMSG is returned. Fixes: 4f73175d0375 ("X.509: Add utility functions to render OIDs as strings") Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/oid_registry.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/oid_registry.c b/lib/oid_registry.c
index 5a75d127995d..0bcac6ccb1b2 100644
--- a/lib/oid_registry.c
+++ b/lib/oid_registry.c
@@ -116,7 +116,7 @@ int sprint_oid(const void *data, size_t datasize, char *buffer, size_t bufsize)
int count;
if (v >= end)
- return -EBADMSG;
+ goto bad;
n = *v++;
ret = count = snprintf(buffer, bufsize, "%u.%u", n / 40, n % 40);
@@ -134,7 +134,7 @@ int sprint_oid(const void *data, size_t datasize, char *buffer, size_t bufsize)
num = n & 0x7f;
do {
if (v >= end)
- return -EBADMSG;
+ goto bad;
n = *v++;
num <<= 7;
num |= n & 0x7f;
@@ -148,6 +148,10 @@ int sprint_oid(const void *data, size_t datasize, char *buffer, size_t bufsize)
}
return ret;
+
+bad:
+ snprintf(buffer, bufsize, "(bad)");
+ return -EBADMSG;
}
EXPORT_SYMBOL_GPL(sprint_oid);