id,summary,reporter,owner,description,type,status,priority,component,version,resolution,keywords,cc,blockedby,blocking,reproduced,analyzed
1904,image2: cannot open files not readable by owner,robert,,"Summary of the bug:

file_check() in libavformat/file.c makes loading of image2 sequences fail (not tried with other types of files but I guess it afects all users of this function). The problem is that it checks if the owner has read permissions, but a file can be readable even when the owner has no read permissions if ""others"" have read permission. This tipically happens on Android systems, for example in the removable sdcard mounted as /mnt/sdcard.

How to reproduce:

Call avformat_open_input() with an image filename in a directory that is not readable by the owner. For example, in a directory with the following permissions: ----r-xr-x

Proposed fix:

divVerent in #ffmpeg@irc.freenode.net proposed this fix: 

{{{
static int file_check(URLContext *h, int mask)
{
    int ret = 0;
    if(mask&AVIO_FLAG_READ)
        if(access(h->filename, R_OK) >= 0)
            ret |= AVIO_FLAG_READ;
    if(mask&AVIO_FLAG_WRITE)
        if(access(h->filename, W_OK) >= 0)
            ret |= AVIO_FLAG_WRITE;
    return ret;
}
}}}
i.e use access() instead of stat(). But he says access() has issues on Windows...",defect,closed,normal,avformat,git-master,fixed,image2,,,,1,1