diff options
| author | Peter Huewe <PeterHuewe@gmx.de> | 2013-10-30 20:46:55 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-06 11:22:18 -0800 |
| commit | 008ec9d9293b6738e90444aa21993d5def8f2d85 (patch) | |
| tree | 87dca799695d2d79b31ce624883cf9ddce5dbed2 /drivers/char | |
| parent | e0383660eb2692180b23a8b833fd8b13c602de28 (diff) | |
tpm/tpm_ppi: Do not compare strcmp(a,b) == -1
commit 747d35bd9bb4ae6bd74b19baa5bbe32f3e0cee11 upstream.
Depending on the implementation strcmp might return the difference between
two strings not only -1,0,1 consequently
if (strcmp (a,b) == -1)
might lead to taking the wrong branch
-> compare with < 0 instead,
which in any case is more canonical.
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tpm/tpm_ppi.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c index 57a818b2b5f2..811ad1e4d802 100644 --- a/drivers/char/tpm/tpm_ppi.c +++ b/drivers/char/tpm/tpm_ppi.c @@ -172,7 +172,7 @@ static ssize_t tpm_store_ppi_request(struct device *dev, * is updated with function index from SUBREQ to SUBREQ2 since PPI * version 1.1 */ - if (strcmp(version, "1.1") == -1) + if (strcmp(version, "1.1") < 0) params[2].integer.value = TPM_PPI_FN_SUBREQ; else params[2].integer.value = TPM_PPI_FN_SUBREQ2; @@ -182,7 +182,7 @@ static ssize_t tpm_store_ppi_request(struct device *dev, * string/package type. For PPI version 1.0 and 1.1, use buffer type * for compatibility, and use package type since 1.2 according to spec. */ - if (strcmp(version, "1.2") == -1) { + if (strcmp(version, "1.2") < 0) { params[3].type = ACPI_TYPE_BUFFER; params[3].buffer.length = sizeof(req); sscanf(buf, "%d", &req); @@ -248,7 +248,7 @@ static ssize_t tpm_show_ppi_transition_action(struct device *dev, * (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for * compatibility, define params[3].type as buffer, if PPI version < 1.2 */ - if (strcmp(version, "1.2") == -1) { + if (strcmp(version, "1.2") < 0) { params[3].type = ACPI_TYPE_BUFFER; params[3].buffer.length = 0; params[3].buffer.pointer = NULL; @@ -390,7 +390,7 @@ static ssize_t show_ppi_operations(char *buf, u32 start, u32 end) kfree(output.pointer); output.length = ACPI_ALLOCATE_BUFFER; output.pointer = NULL; - if (strcmp(version, "1.2") == -1) + if (strcmp(version, "1.2") < 0) return -EPERM; params[2].integer.value = TPM_PPI_FN_GETOPR; |