Re: [PATCH] Don't crash if ai_canonname comes back as null

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On Apr 29, 2009, at 6:21 PM, Junio C Hamano wrote:

Augie Fackler <durin42@xxxxxxxxx> writes:

Fixes a weird bug where git-daemon was segfaulting
when started by sh(1) because ai_canonname was null.
---
Fixed based on feedback.

Hmm.

I've been waiting for feedback to a patch proposed earlier in the same
area, which is <49F5BA55.3060606@xxxxxxxxxxxxxx> ($gmane/117670).  How
does this new one relate to it?

I can't comment much on the correctness of the code - my patch was the minimal change to have it not crash.

The other patch also works for me to prevent the crash, and looks like it might be a little more correct in terms of having a meaningful hostname.

daemon.c |    2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/daemon.c b/daemon.c
index 13401f1..ae21d92 100644
--- a/daemon.c
+++ b/daemon.c
@@ -459,7 +459,7 @@ static void parse_extra_args(char *extra_args, int
buflen)
				inet_ntop(AF_INET, &sin_addr->sin_addr,
					  addrbuf, sizeof(addrbuf));
				free(canon_hostname);
-				canon_hostname = xstrdup(ai->ai_canonname);
+				canon_hostname = ai->ai_canonname ?
xstrdup(ai->ai_canonname) : NULL;
				free(ip_address);
				ip_address = xstrdup(addrbuf);
				break;
--
1.6.2.GIT


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