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

[SPeak Shen]

From: shenyanfeng <shenyanf...@xiaomi.com>

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

Signed-off-by: SPeak <speaks...@163.com>
Signed-off-by: shenyanfeng <shenyanf...@xiaomi.com>
---


Receive "Undelivered Mail Returned to Sender", so send again


 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);
-- 
2.25.1