[virglrenderer-devel] [PATCH v2] gallium/tgsi: fix overflow in parse property

[Li Qiang]

In parse_identifier, it doesn't stop copying '*pcur'
untill encounter the NULL. As the 'ret' has a fixed-size
buffer, if the '*pcur' has a long string, there will be
a buffer overflow. This patch avoid this.

Signed-off-by: Li Qiang <liq3ea at gmail.com>
---
 src/gallium/auxiliary/tgsi/tgsi_text.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_text.c b/src/gallium/auxiliary/tgsi/tgsi_text.c
index 1b4f594..599cd99 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_text.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_text.c
@@ -208,14 +208,17 @@ static boolean parse_int( const char **pcur, int *val )
    return FALSE;
 }
 
-static boolean parse_identifier( const char **pcur, char *ret )
+static boolean parse_identifier( const char **pcur, char *ret, size_t len )
 {
    const char *cur = *pcur;
    int i = 0;
    if (is_alpha_underscore( cur )) {
       ret[i++] = *cur++;
-      while (is_alpha_underscore( cur ) || is_digit( cur ))
+      while (is_alpha_underscore( cur ) || is_digit( cur )) {
+         if ( i >= len - 1 )
+            return FALSE;
          ret[i++] = *cur++;
+      }
       ret[i++] = '\0';
       *pcur = cur;
       return TRUE;
@@ -1787,7 +1790,7 @@ static boolean parse_property( struct translate_ctx *ctx )
       report_error( ctx, "Syntax error" );
       return FALSE;
    }
-   if (!parse_identifier( &ctx->cur, id )) {
+   if (!parse_identifier( &ctx->cur, id, sizeof(id) )) {
       report_error( ctx, "Syntax error" );
       return FALSE;
    }
-- 
2.7.4