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author | Ingo Molnar <mingo@kernel.org> | 2017-11-07 10:32:44 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2017-11-07 10:32:44 +0100 |
commit | 8c5db92a705d9e2c986adec475980d1120fa07b4 (patch) | |
tree | 9f0eea56889819707c0a1a8eb5b1fb2db3cdaf3d /security/keys/keyring.c | |
parent | ca5d376e17072c1b60c3fee66f3be58ef018952d (diff) | |
parent | e4880bc5dfb1f02b152e62a894b5c6f3e995b3cf (diff) | |
download | talos-op-linux-8c5db92a705d9e2c986adec475980d1120fa07b4.tar.gz talos-op-linux-8c5db92a705d9e2c986adec475980d1120fa07b4.zip |
Merge branch 'linus' into locking/core, to resolve conflicts
Conflicts:
include/linux/compiler-clang.h
include/linux/compiler-gcc.h
include/linux/compiler-intel.h
include/uapi/linux/stddef.h
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'security/keys/keyring.c')
-rw-r--r-- | security/keys/keyring.c | 39 |
1 files changed, 19 insertions, 20 deletions
diff --git a/security/keys/keyring.c b/security/keys/keyring.c index a7e51f793867..36f842ec87f0 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -459,34 +459,33 @@ static long keyring_read(const struct key *keyring, char __user *buffer, size_t buflen) { struct keyring_read_iterator_context ctx; - unsigned long nr_keys; - int ret; + long ret; kenter("{%d},,%zu", key_serial(keyring), buflen); if (buflen & (sizeof(key_serial_t) - 1)) return -EINVAL; - nr_keys = keyring->keys.nr_leaves_on_tree; - if (nr_keys == 0) - return 0; - - /* Calculate how much data we could return */ - if (!buffer || !buflen) - return nr_keys * sizeof(key_serial_t); - - /* Copy the IDs of the subscribed keys into the buffer */ - ctx.buffer = (key_serial_t __user *)buffer; - ctx.buflen = buflen; - ctx.count = 0; - ret = assoc_array_iterate(&keyring->keys, keyring_read_iterator, &ctx); - if (ret < 0) { - kleave(" = %d [iterate]", ret); - return ret; + /* Copy as many key IDs as fit into the buffer */ + if (buffer && buflen) { + ctx.buffer = (key_serial_t __user *)buffer; + ctx.buflen = buflen; + ctx.count = 0; + ret = assoc_array_iterate(&keyring->keys, + keyring_read_iterator, &ctx); + if (ret < 0) { + kleave(" = %ld [iterate]", ret); + return ret; + } } - kleave(" = %zu [ok]", ctx.count); - return ctx.count; + /* Return the size of the buffer needed */ + ret = keyring->keys.nr_leaves_on_tree * sizeof(key_serial_t); + if (ret <= buflen) + kleave("= %ld [ok]", ret); + else + kleave("= %ld [buffer too small]", ret); + return ret; } /* |