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core/cfs: Disallow seeking past the end of a file if it is not writable

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This commit is contained in:
Joakim Nohlgård 2016-04-23 10:03:09 +02:00
parent 0e9234dce6
commit 19550f9f7f
1 changed files with 6 additions and 1 deletions
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7
core/cfs/cfs-coffee.c
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@ -1055,7 +1055,12 @@ cfs_seek(int fd, cfs_offset_t offset, int whence)
} }
if(fdp->file->end < new_offset) { if(fdp->file->end < new_offset) {
fdp->file->end = new_offset; if(FD_WRITABLE(fd)) {
fdp->file->end = new_offset;
} else {
/* Disallow seeking past the end of the file for read only FDs */
return (cfs_offset_t)-1;
}
} }
return fdp->offset = new_offset; return fdp->offset = new_offset;