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ASoC: Intel: sst: Fix firmware name size handling

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Function sst_acpi_probe() uses plain strcpy for setting member firmware_name
of a struct intel_sst_drv from member firmware of a struct sst_machines.
Thereby the destination array has got a length of 20 byte while the source may
hold 32 byte. Since eg. commit 64b9c90b86 ("ASoC: Intel: Fix BYTCR firmware
name") increased strings from "fw_sst_0f28.bin" to "intel/fw_sst_0f28.bin"
there is an actual possibility that the 20 byte array at the end of struct
intel_sst_drv is overrun.

Thus increase the size of the destination and use the same define for both
structs. Detected by Coverity CID 1260087.

Signed-off-by: Christian Engelmayer <cengelma@gmx.at>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Christian Engelmayer 2015-02-07 23:40:52 +01:00 committed by Mark Brown
parent 5c2b06369d
commit 279e17ae81
2 changed files with 3 additions and 2 deletions
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3
sound/soc/intel/sst/sst.h
View File

@ -58,6 +58,7 @@ enum sst_algo_ops {
#define SST_BLOCK_TIMEOUT 1000
#define FW_SIGNATURE_SIZE 4
#define FW_NAME_SIZE 32
/* stream states */
enum sst_stream_states {
@ -426,7 +427,7 @@ struct intel_sst_drv {
* Holder for firmware name. Due to async call it needs to be
* persistent till worker thread gets called
*/
char firmware_name[20];
char firmware_name[FW_NAME_SIZE];
};
/* misc definitions */

2
sound/soc/intel/sst/sst_acpi.c
View File

@ -47,7 +47,7 @@ struct sst_machines {
char board[32];
char machine[32];
void (*machine_quirk)(void);
char firmware[32];
char firmware[FW_NAME_SIZE];
struct sst_platform_info *pdata;
};