On Wed, Aug 17, 2011 at 11:34:19AM -0400, Dave Reisner wrote: > On Wed, Aug 17, 2011 at 04:45:35PM +0200, Lukas Fleischer wrote: > > Avoid a potential segfault that may occur if we use a temporary file and > > fail to build the destination file name from the effective URL. > > > > Signed-off-by: Lukas Fleischer <archli...@cryptocrack.de> > > --- > > Untested, sorry. Should be trivial enough not to break anything though. > > Hopefully. > > > > lib/libalpm/dload.c | 14 +++++++++----- > > 1 files changed, 9 insertions(+), 5 deletions(-) > > > > diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c > > index 731d807..5cbb6b4 100644 > > --- a/lib/libalpm/dload.c > > +++ b/lib/libalpm/dload.c > > @@ -384,12 +384,16 @@ cleanup: > > } > > > > if(ret == 0) { > > - if(rename(tempfile, destfile)) { > > - _alpm_log(handle, ALPM_LOG_ERROR, _("could not rename > > %s to %s (%s)\n"), > > - tempfile, destfile, strerror(errno)); > > - ret = -1; > > + if (destfile) { > > + if(rename(tempfile, destfile)) { > > + _alpm_log(handle, ALPM_LOG_ERROR, _("could not > > rename %s to %s (%s)\n"), > > + tempfile, destfile, > > strerror(errno)); > > + ret = -1; > > + } else if(final_file) { > > + *final_file = strdup(strrchr(destfile, '/') + > > 1); > > + } > > } else if(final_file) { > > - *final_file = strdup(strrchr(destfile, '/') + 1); > > + *final_file = strdup(strrchr(tempfile, '/') + 1); > > If you're going to change this line, can you use the STRDUP macro like I > should have? > > STRDUP(final_file, tempfile, RET_ERR(handle, ALPM_ERR_MEMORY, -1)); > > Same for the added strdup inside the if(destfile) block. Looks fine > otherwise. > > > } > > }
Note that this doesn't actually solve the issue of a zero length filename... ┌┤noclaf@rampage:1 bugfix ~/src/c/pacman └╼ sudo ./src/pacman/pacman -U http://www.archlinux.org/ alpmtmp.sj9IKg 23.2K 443.7K/s 00:00:00 [-----------------------] 100% error: could not rename /mnt/Haven/packages/alpmtmp.sj9IKg to /mnt/Haven/packages/ (Not a directory) warning: failed to download http://www.archlinux.org/ error: 'http://www.archlinux.org/': unexpected error