diff options
Diffstat (limited to 'drivers/input/tablet/gtco.c')
| -rw-r--r-- | drivers/input/tablet/gtco.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/input/tablet/gtco.c b/drivers/input/tablet/gtco.c index 4b8b9d7aa75e..35031228a6d0 100644 --- a/drivers/input/tablet/gtco.c +++ b/drivers/input/tablet/gtco.c @@ -78,6 +78,7 @@ Scott Hill shill@gtcocalcomp.com /* Max size of a single report */ #define REPORT_MAX_SIZE 10 +#define MAX_COLLECTION_LEVELS 10 /* Bitmask whether pen is in range */ @@ -223,8 +224,7 @@ static void parse_hid_report_descriptor(struct gtco *device, char * report, char maintype = 'x'; char globtype[12]; int indent = 0; - char indentstr[10] = ""; - + char indentstr[MAX_COLLECTION_LEVELS + 1] = { 0 }; dev_dbg(ddev, "======>>>>>>PARSE<<<<<<======\n"); @@ -350,6 +350,13 @@ static void parse_hid_report_descriptor(struct gtco *device, char * report, case TAG_MAIN_COL_START: maintype = 'S'; + if (indent == MAX_COLLECTION_LEVELS) { + dev_err(ddev, "Collection level %d would exceed limit of %d\n", + indent + 1, + MAX_COLLECTION_LEVELS); + break; + } + if (data == 0) { dev_dbg(ddev, "======>>>>>> Physical\n"); strcpy(globtype, "Physical"); @@ -369,8 +376,15 @@ static void parse_hid_report_descriptor(struct gtco *device, char * report, break; case TAG_MAIN_COL_END: - dev_dbg(ddev, "<<<<<<======\n"); maintype = 'E'; + + if (indent == 0) { + dev_err(ddev, "Collection level already at zero\n"); + break; + } + + dev_dbg(ddev, "<<<<<<======\n"); + indent--; for (x = 0; x < indent; x++) indentstr[x] = '-'; |