From 1fea629f794cda57cc161979dab903ec7460cc7c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Fri, 30 Sep 2005 23:25:23 -0700 Subject: [PATCH] [PATCH] Flag empty patches as errors A patch that contains no actual diff, and that doesn't change any meta-data is bad. It shouldn't be a patch at all, and git-apply shouldn't just accept it. This caused a corrupted patch to be silently applied as an empty change in the kernel, because the corruption ended up making the patch look empty. An example of such a patch is one that contains the patch header, but where the initial fragment header (the "@@ -nr,.." line) is missing, causing us to not parse any fragments. The real "patch" program will also flag such patches as bad, with the message patch: **** Only garbage was found in the patch input. and we should do likewise. Signed-off-by: Linus Torvalds Signed-off-by: Junio C Hamano --- apply.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/apply.c b/apply.c index 964df2db1..f8862722f 100644 --- a/apply.c +++ b/apply.c @@ -723,6 +723,16 @@ static int parse_single_patch(char *line, unsigned long size, struct patch *patc return offset; } +static inline int metadata_changes(struct patch *patch) +{ + return patch->is_rename > 0 || + patch->is_copy > 0 || + patch->is_new > 0 || + patch->is_delete || + (patch->old_mode && patch->new_mode && + patch->old_mode != patch->new_mode); +} + static int parse_chunk(char *buffer, unsigned long size, struct patch *patch) { int hdrsize, patchsize; @@ -733,6 +743,9 @@ static int parse_chunk(char *buffer, unsigned long size, struct patch *patch) patchsize = parse_single_patch(buffer + offset + hdrsize, size - offset - hdrsize, patch); + if (!patchsize && !metadata_changes(patch)) + die("patch with only garbage at line %d", linenr); + return offset + hdrsize + patchsize; } -- 2.30.2