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| author | Jonathan McDowell <noodles@meta.com> | 2024-08-16 12:55:46 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-17 15:20:55 +0200 |
| commit | c84ceb546f30432fccea4891163f7050f5bee5dd (patch) | |
| tree | 6b0b019f93c4596d270ba3200d0a0a2be5ac9b54 /drivers/char | |
| parent | 1bd4e5a74da9855af7a9c4a0ad9c715fe05a148f (diff) | |
| download | linux-c84ceb546f30432fccea4891163f7050f5bee5dd.tar.gz linux-c84ceb546f30432fccea4891163f7050f5bee5dd.tar.bz2 linux-c84ceb546f30432fccea4891163f7050f5bee5dd.zip | |
tpm: Clean up TPM space after command failure
[ Upstream commit e3aaebcbb7c6b403416f442d1de70d437ce313a7 ]
tpm_dev_transmit prepares the TPM space before attempting command
transmission. However if the command fails no rollback of this
preparation is done. This can result in transient handles being leaked
if the device is subsequently closed with no further commands performed.
Fix this by flushing the space in the event of command transmission
failure.
Fixes: 745b361e989a ("tpm: infrastructure for TPM spaces")
Signed-off-by: Jonathan McDowell <noodles@meta.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm-dev-common.c | 2 | ||||
| -rw-r--r-- | drivers/char/tpm/tpm2-space.c | 3 |
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm-dev-common.c b/drivers/char/tpm/tpm-dev-common.c index 30b4c288c1bb..c3fbbf4d3db7 100644 --- a/drivers/char/tpm/tpm-dev-common.c +++ b/drivers/char/tpm/tpm-dev-common.c @@ -47,6 +47,8 @@ static ssize_t tpm_dev_transmit(struct tpm_chip *chip, struct tpm_space *space, if (!ret) ret = tpm2_commit_space(chip, space, buf, &len); + else + tpm2_flush_space(chip); out_rc: return ret ? ret : len; diff --git a/drivers/char/tpm/tpm2-space.c b/drivers/char/tpm/tpm2-space.c index ffb35f0154c1..c57404c6b98c 100644 --- a/drivers/char/tpm/tpm2-space.c +++ b/drivers/char/tpm/tpm2-space.c @@ -166,6 +166,9 @@ void tpm2_flush_space(struct tpm_chip *chip) struct tpm_space *space = &chip->work_space; int i; + if (!space) + return; + for (i = 0; i < ARRAY_SIZE(space->context_tbl); i++) if (space->context_tbl[i] && ~space->context_tbl[i]) tpm2_flush_context(chip, space->context_tbl[i]); |