/* * Copyright (c) 2010 Serge A. Zaitsev * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * Slightly modified by AK to not assume 0 terminated input. */ #include #include "jsmn.h" /* * Allocates a fresh unused token from the token pool. */ static jsmntok_t *jsmn_alloc_token(jsmn_parser *parser, jsmntok_t *tokens, size_t num_tokens) { jsmntok_t *tok; if ((unsigned)parser->toknext >= num_tokens) return NULL; tok = &tokens[parser->toknext++]; tok->start = tok->end = -1; tok->size = 0; return tok; } /* * Fills token type and boundaries. */ static void jsmn_fill_token(jsmntok_t *token, jsmntype_t type, int start, int end) { token->type = type; token->start = start; token->end = end; token->size = 0; } /* * Fills next available token with JSON primitive. */ static jsmnerr_t jsmn_parse_primitive(jsmn_parser *parser, const char *js, size_t len, jsmntok_t *tokens, size_t num_tokens) { jsmntok_t *token; int start; start = parser->pos; for (; parser->pos < len; parser->pos++) { switch (js[parser->pos]) { #ifndef JSMN_STRICT /* * In strict mode primitive must be followed by "," * or "}" or "]" */ case ':': #endif case '\t': case '\r': case '\n': case ' ': case ',': case ']': case '}': goto found; default: break; } if (js[parser->pos] < 32 || js[parser->pos] >= 127) { parser->pos = start; return JSMN_ERROR_INVAL; } } #ifdef JSMN_STRICT /* * In strict mode primitive must be followed by a * comma/object/array. */ parser->pos = start; return JSMN_ERROR_PART; #endif found: token = jsmn_alloc_token(parser, tokens, num_tokens); if (token == NULL) { parser->pos = start; return JSMN_ERROR_NOMEM; } jsmn_fill_token(token, JSMN_PRIMITIVE, start, parser->pos); parser->pos--; /* parent sees closing brackets */ return JSMN_SUCCESS; } /* * Fills next token with JSON string. */ static jsmnerr_t jsmn_parse_string(jsmn_parser *parser, const char *js, size_t len, jsmntok_t *tokens, size_t num_tokens) { jsmntok_t *token; int start = parser->pos; /* Skip starting quote */ parser->pos++; for (; parser->pos < len; parser->pos++) { char c = js[parser->pos]; /* Quote: end of string */ if (c == '\"') { token = jsmn_alloc_token(parser, tokens, num_tokens); if (token == NULL) { parser->pos = start; return JSMN_ERROR_NOMEM; } jsmn_fill_token(token, JSMN_STRING, start+1, parser->pos); return JSMN_SUCCESS; } /* Backslash: Quoted symbol expected */ if (c == '\\') { parser->pos++; switch (js[parser->pos]) { /* Allowed escaped symbols */ case '\"': case '/': case '\\': case 'b': case 'f': case 'r': case 'n': case 't': break; /* Allows escaped symbol \uXXXX */ case 'u': /* TODO */ break; /* Unexpected symbol */ default: parser->pos = start; return JSMN_ERROR_INVAL; } } } parser->pos = start; return JSMN_ERROR_PART; } /* * Parse JSON string and fill tokens. */ jsmnerr_t jsmn_parse(jsmn_parser *parser, const char *js, size_t len, jsmntok_t *tokens, unsigned int num_tokens) { jsmnerr_t r; int i; jsmntok_t *token; for (; parser->pos < len; parser->pos++) { char c; jsmntype_t type; c = js[parser->pos]; switch (c) { case '{': case '[': token = jsmn_alloc_token(parser, tokens, num_tokens); if (token == NULL) return JSMN_ERROR_NOMEM; if (parser->toksuper != -1) tokens[parser->toksuper].size++; token->type = (c == '{' ? JSMN_OBJECT : JSMN_ARRAY); token->start = parser->pos; parser->toksuper = parser->toknext - 1; break; case '}': case ']': type = (c == '}' ? JSMN_OBJECT : JSMN_ARRAY); for (i = parser->toknext - 1; i >= 0; i--) { token = &tokens[i]; if (token->start != -1 && token->end == -1) { if (token->type != type) return JSMN_ERROR_INVAL; parser->toksuper = -1; token->end = parser->pos + 1; break; } } /* Error if unmatched closing bracket */ if (i == -1) return JSMN_ERROR_INVAL; for (; i >= 0; i--) { token = &tokens[i]; if (token->start != -1 && token->end == -1) { parser->toksuper = i; break; } } break; case '\"': r = jsmn_parse_string(parser, js, len, tokens, num_tokens); if (r < 0) return r; if (parser->toksuper != -1) tokens[parser->toksuper].size++; break; case '\t': case '\r': case '\n': case ':': case ',': case ' ': break; #ifdef JSMN_STRICT /* * In strict mode primitives are: * numbers and booleans. */ case '-': case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': case 't': case 'f': case 'n': #else /* * In non-strict mode every unquoted value * is a primitive. */ /*FALL THROUGH */ default: #endif r = jsmn_parse_primitive(parser, js, len, tokens, num_tokens); if (r < 0) return r; if (parser->toksuper != -1) tokens[parser->toksuper].size++; break; #ifdef JSMN_STRICT /* Unexpected char in strict mode */ default: return JSMN_ERROR_INVAL; #endif } } for (i = parser->toknext - 1; i >= 0; i--) { /* Unmatched opened object or array */ if (tokens[i].start != -1 && tokens[i].end == -1) return JSMN_ERROR_PART; } return JSMN_SUCCESS; } /* * Creates a new parser based over a given buffer with an array of tokens * available. */ void jsmn_init(jsmn_parser *parser) { parser->pos = 0; parser->toknext = 0; parser->toksuper = -1; } const char *jsmn_strerror(jsmnerr_t err) { switch (err) { case JSMN_ERROR_NOMEM: return "No enough tokens"; case JSMN_ERROR_INVAL: return "Invalid character inside JSON string"; case JSMN_ERROR_PART: return "The string is not a full JSON packet, more bytes expected"; case JSMN_SUCCESS: return "Success"; default: return "Unknown json error"; } } vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net/sched/act_meta_mark.c')