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usbip: fix usbip bind writing random string after command in match_busid

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usbip bind writes commands followed by random string when writing to
match_busid attribute in sysfs, caused by using full variable size
instead of string length.

Signed-off-by: Juan Zea <juan.zea@qindel.com>
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Juan Zea 2017-12-15 10:21:20 +01:00 committed by Greg Kroah-Hartman
parent 10c9012093
commit 544c4605ac
1 changed files with 6 additions and 3 deletions
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9
tools/usb/usbip/src/utils.c
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@ -30,6 +30,7 @@ int modify_match_busid(char *busid, int add)
char command[SYSFS_BUS_ID_SIZE + 4]; char command[SYSFS_BUS_ID_SIZE + 4];
char match_busid_attr_path[SYSFS_PATH_MAX]; char match_busid_attr_path[SYSFS_PATH_MAX];
int rc; int rc;
int cmd_size;
snprintf(match_busid_attr_path, sizeof(match_busid_attr_path), snprintf(match_busid_attr_path, sizeof(match_busid_attr_path),
"%s/%s/%s/%s/%s/%s", SYSFS_MNT_PATH, SYSFS_BUS_NAME, "%s/%s/%s/%s/%s/%s", SYSFS_MNT_PATH, SYSFS_BUS_NAME,
@ -37,12 +38,14 @@ int modify_match_busid(char *busid, int add)
attr_name); attr_name);
if (add) if (add)
snprintf(command, SYSFS_BUS_ID_SIZE + 4, "add %s", busid); cmd_size = snprintf(command, SYSFS_BUS_ID_SIZE + 4, "add %s",
busid);
else else
snprintf(command, SYSFS_BUS_ID_SIZE + 4, "del %s", busid); cmd_size = snprintf(command, SYSFS_BUS_ID_SIZE + 4, "del %s",
busid);
rc = write_sysfs_attribute(match_busid_attr_path, command, rc = write_sysfs_attribute(match_busid_attr_path, command,
sizeof(command)); cmd_size);
if (rc < 0) { if (rc < 0) {
dbg("failed to write match_busid: %s", strerror(errno)); dbg("failed to write match_busid: %s", strerror(errno));
return -1; return -1;