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WPrefs: add check for image validity in 'loadRImage' (Coverity #50221, #50081)

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As pointed by Coverity, the function blindly trust the data read from the
file, but in case of problem (corrupted file, not enough memory) it could
behave badly.

This patch adds a check for the depth, counts on RCreateImage to check the
width and height, and in any case it now includes a message for the user in
case he would like to understand what's wrong.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
Signed-off-by: Carlos R. Mafra <crmafra@gmail.com>
This commit is contained in:
Christophe CURIS
2014-11-15 19:41:00 +01:00
committed by Carlos R. Mafra
parent d1e1521a88
commit 3a15750ad5
1 changed files with 12 additions and 0 deletions
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12
WPrefs.app/Appearance.c
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@@ -1310,10 +1310,22 @@ static Pixmap loadRImage(WMScreen * scr, const char *path)
cnt = fscanf(f, "%02x%02x%1x", &w, &h, &d);
if (cnt != 3) {
wwarning(_("could not read size of image from '%s', ignoring"), path);
fclose(f);
return None;
}
if (d < 3 || d > 4) {
wwarning(_("image \"%s\" has an invalid depth of %d, ignoring"), path, d);
fclose(f);
return None;
}
image = RCreateImage(w, h, d == 4);
if (image == NULL) {
wwarning(_("could not create RImage for \"%s\": %s"),
path, RMessageForError(RErrorCode));
fclose(f);
return None;
}
read_size = w * h * d;
if (fread(image->data, 1, read_size, f) == read_size)
RConvertImage(WMScreenRContext(scr), image, &pixmap);