Subject: [PATCH] driver: gpu: add failure check for ftell

[沈言峰]

add return-value check of ftell to improve robustness(and avoid abnormal behavior)

Signed-off-by: SPeak <speakshen at 163.com>
Signed-off-by: shenyanfeng <shenyanfeng at xiaomi.com>
---
 drivers/gpu/drm/radeon/mkregtable.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/radeon/mkregtable.c b/drivers/gpu/drm/radeon/mkregtable.c
index 52a7246fe..c31c58e5f 100644
--- a/drivers/gpu/drm/radeon/mkregtable.c
+++ b/drivers/gpu/drm/radeon/mkregtable.c
@@ -193,6 +193,7 @@ static int parser_auth(struct table *t, const char *filename)
  regmatch_t match[4];
  char buf[1024];
  size_t end;
+ long pos;
  int len;
  int done = 0;
  int r;
@@ -228,12 +229,12 @@ static int parser_auth(struct table *t, const char *filename)
  last_reg = strtol(last_reg_s, NULL, 16);

  do {
- if (fgets(buf, 1024, file) == NULL) {
+ if ((fgets(buf, 1024, file) == NULL) || (pos = ftell(file)) < 0) {
  fclose(file);
  return -1;
  }
  len = strlen(buf);
- if (ftell(file) == end)
+ if (pos == end)
  done = 1;
  if (len) {
  r = regexec(&mask_rex, buf, 4, match, 0);
--
2.37.2

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