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:recover : Fix crash on non-existent *.swp #9504

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Reverts d2944e6a29. mf_open() _can_ fail if the file does not exist.

closes #9503
closes #9504
This commit is contained in:
raffitz 2019-01-14 14:09:47 +00:00 committed by Justin M. Keyes
parent 387ab4f706
commit 95fa71c6d2
4 changed files with 23 additions and 11 deletions
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3
src/nvim/memfile.c
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@ -76,7 +76,8 @@
/// @param flags Flags for open() call. /// @param flags Flags for open() call.
/// ///
/// @return The open memory file. /// @return - The open memory file, on success.
/// - NULL, on failure (e.g. file does not exist).
memfile_T *mf_open(char_u *fname, int flags) memfile_T *mf_open(char_u *fname, int flags)
{ {
memfile_T *mfp = xmalloc(sizeof(memfile_T)); memfile_T *mfp = xmalloc(sizeof(memfile_T));

13
src/nvim/memline.c
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@ -277,6 +277,9 @@ int ml_open(buf_T *buf)
// Open the memfile. No swap file is created yet. // Open the memfile. No swap file is created yet.
memfile_T *mfp = mf_open(NULL, 0); memfile_T *mfp = mf_open(NULL, 0);
if (mfp == NULL) {
goto error;
}
buf->b_ml.ml_mfp = mfp; buf->b_ml.ml_mfp = mfp;
buf->b_ml.ml_flags = ML_EMPTY; buf->b_ml.ml_flags = ML_EMPTY;
@ -360,10 +363,12 @@ int ml_open(buf_T *buf)
return OK; return OK;
error: error:
if (hp) { if (mfp != NULL) {
mf_put(mfp, hp, false, false); if (hp) {
mf_put(mfp, hp, false, false);
}
mf_close(mfp, true); // will also xfree(mfp->mf_fname)
} }
mf_close(mfp, true); // will also xfree(mfp->mf_fname)
buf->b_ml.ml_mfp = NULL; buf->b_ml.ml_mfp = NULL;
return FAIL; return FAIL;
} }
@ -839,7 +844,7 @@ void ml_recover(void)
mf_open() will consume "fname_used"! */ mf_open() will consume "fname_used"! */
mfp = mf_open(fname_used, O_RDONLY); mfp = mf_open(fname_used, O_RDONLY);
fname_used = p; fname_used = p;
if (mfp->mf_fd < 0) { if (mfp == NULL || mfp->mf_fd < 0) {
EMSG2(_("E306: Cannot open %s"), fname_used); EMSG2(_("E306: Cannot open %s"), fname_used);
goto theend; goto theend;
} }

2
src/nvim/spell.c
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@ -2510,7 +2510,7 @@ buf_T *open_spellbuf(void)
buf->b_spell = true; buf->b_spell = true;
buf->b_p_swf = true; // may create a swap file buf->b_p_swf = true; // may create a swap file
if (ml_open(buf) == FAIL) { if (ml_open(buf) == FAIL) {
abort(); ELOG("Error opening a new memline");
} }
ml_open_file(buf); // create swap file now ml_open_file(buf); // create swap file now

16
test/functional/ex_cmds/swapfile_preserve_recover_spec.lua
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@ -1,10 +1,11 @@
local Screen = require('test.functional.ui.screen') local Screen = require('test.functional.ui.screen')
local helpers = require('test.functional.helpers')(after_each) local helpers = require('test.functional.helpers')(after_each)
local lfs = require('lfs') local lfs = require('lfs')
local feed_command, eq, eval, expect, source = local eq, eval, expect, source =
helpers.feed_command, helpers.eq, helpers.eval, helpers.expect, helpers.source helpers.eq, helpers.eval, helpers.expect, helpers.source
local clear = helpers.clear local clear = helpers.clear
local command = helpers.command local command = helpers.command
local expect_err = helpers.expect_err
local feed = helpers.feed local feed = helpers.feed
local nvim_prog = helpers.nvim_prog local nvim_prog = helpers.nvim_prog
local ok = helpers.ok local ok = helpers.ok
@ -17,9 +18,14 @@ describe(':recover', function()
before_each(clear) before_each(clear)
it('fails if given a non-existent swapfile', function() it('fails if given a non-existent swapfile', function()
local swapname = 'bogus-swapfile' local swapname = 'bogus_swapfile'
feed_command('recover '..swapname) -- This should not segfault. #2117 local swapname2 = 'bogus_swapfile.swp'
eq('E305: No swap file found for '..swapname, eval('v:errmsg')) expect_err('E305: No swap file found for '..swapname,
command, 'recover '..swapname) -- Should not segfault. #2117
-- Also check filename ending with ".swp". #9504
expect_err('Vim%(recover%):E306: Cannot open '..swapname2,
command, 'recover '..swapname2) -- Should not segfault. #2117
eq(2, eval('1+1')) -- Still alive?
end) end)
end) end)