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Fixed potential negative value misinterpretation in load_file()

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This commit is contained in:
Paul Bakker 2013-08-19 14:29:31 +02:00
parent 75c1a6f97c
commit 42c3ccf36e
1 changed files with 8 additions and 1 deletions
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9
library/x509parse.c
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@ -1917,14 +1917,21 @@ int x509parse_crl( x509_crl *chain, const unsigned char *buf, size_t buflen )
static int load_file( const char *path, unsigned char **buf, size_t *n ) static int load_file( const char *path, unsigned char **buf, size_t *n )
{ {
FILE *f; FILE *f;
long size;
if( ( f = fopen( path, "rb" ) ) == NULL ) if( ( f = fopen( path, "rb" ) ) == NULL )
return( POLARSSL_ERR_X509_FILE_IO_ERROR ); return( POLARSSL_ERR_X509_FILE_IO_ERROR );
fseek( f, 0, SEEK_END ); fseek( f, 0, SEEK_END );
*n = (size_t) ftell( f ); if( ( size = ftell( f ) ) == -1 )
{
fclose( f );
return( POLARSSL_ERR_X509_FILE_IO_ERROR );
}
fseek( f, 0, SEEK_SET ); fseek( f, 0, SEEK_SET );
*n = (size_t) size;
if( *n + 1 == 0 || if( *n + 1 == 0 ||
( *buf = (unsigned char *) polarssl_malloc( *n + 1 ) ) == NULL ) ( *buf = (unsigned char *) polarssl_malloc( *n + 1 ) ) == NULL )
{ {