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Subject[PATCH 1/2 v2] tpm/tpm_ppi: Do not compare strcmp(a,b) == -1
Date
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.

Cc: stable@vger.kernel.org
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
---
sorry for the rubbish first patch,
should get more sleep, but coding is too much fun;)

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 8e562dc..18c5810 100644
--- a/drivers/char/tpm/tpm_ppi.c
+++ b/drivers/char/tpm/tpm_ppi.c
@@ -169,7 +169,7 @@ 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;
@@ -179,7 +179,7 @@ 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);
@@ -245,7 +245,7 @@ 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;
@@ -387,7 +387,7 @@ 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;
--
1.7.8.6


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